Статті в журналах: "Zinc oxide phosphor thermometry"

1

Hu, Guangxia, Bhupendra Kumar, Hao Gong, E. F. Chor, and Ping Wu. "Transparent indium zinc oxide ohmic contact to phosphor-doped n-type zinc oxide." Applied Physics Letters 88, no. 10 (March 6, 2006): 101901. http://dx.doi.org/10.1063/1.2178404.

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2

Wu, Zhaojie, Li Li, Guang Tian, Yongjie Wang, Faling Ling, Zhongmin Cao, Sha Jiang, Guotao Xiang, Yanhong Li, and Xianju Zhou. "High-sensitivity and wide-temperature-range dual-mode optical thermometry under dual-wavelength excitation in a novel double perovskite tellurate oxide." Dalton Transactions 50, no. 33 (2021): 11412–21. http://dx.doi.org/10.1039/d1dt01147b.

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The high-sensitivity and wide-temperature-range dual-mode optical thermometry for novel double perovskite SrLaLiTeO6:Mn4+,Dy3+ phosphor was exploited. Notably, the relative sensitivity (SR) values can be manipulated by different excitation wavelength.

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3

Li, Ying Yi, Yong Xiu Li, Yan Li Wu, and Wei Li Sun. "Preparation and photoluminescent properties of zinc oxide phosphor." Journal of Luminescence 126, no. 1 (September 2007): 177–81. http://dx.doi.org/10.1016/j.jlumin.2006.06.012.

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4

Choy, K. L., J. P. Feist, A. L. Heyes, and B. Su. "Eu-doped Y2O3 phosphor films produced by electrostatic-assisted chemical vapor deposition." Journal of Materials Research 14, no. 7 (July 1999): 3111–14. http://dx.doi.org/10.1557/jmr.1999.0417.

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Europium-doped yttrium oxide (Y2O3:Eu) thermographic phosphor films were deposited on Ni-alloy substrates using a novel and cost-effective electrostatic-assisted chemical vapor deposition (EACVD) technique. The thermoluminescence properties were studied under irradiation by an ultraviolet laser. It was found that crystallized Y2O3: Eu films could be deposited at a temperature as low as 550 °C. Annealing of the as-deposited films at higher temperatures (>1000 °C) improved the luminescence properties due to further crystallization processes. The correlation of the lifetime decay and temperature change of the films showed that the EACVD-deposited films are suitable for use in phosphor thermometry for high-temperature applications.

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5

Lojpur, Vesna, Zeljka Antic, Radenka Krsmanovic, Mina Medic, Marko Nikolic, and Miroslav Dramicanin. "Thermographic properties of Eu3+ and Sm3+ doped Lu2O3 nanophosphor." Journal of the Serbian Chemical Society 77, no. 12 (2012): 1735–46. http://dx.doi.org/10.2298/jsc121021140l.

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The samples, Lu2O3:Eu3+ (3at.% Eu) and Lu2O3:Sm3+ (1at.% Sm), were prepared via polymer complex solution method using polyethlylene-glyocol as the fuel and as nucleation agent for crystallization process. Knowing that lutetium oxide has high chemical stability and temperature resistance, in this paper we investigated possibility for its application in high-temperature phosphor thermometry. It is a non-contact technique that uses the thermal dependence of phosphor fluorescence to measure temperature remotely. The structural and morphological properties were performed through X-ray powder diffraction (XRPD) and transmission electron microscopy (TEM) investigations. The obtained results confirmed that this synthesis yields desired crystalline structure with particle size in the range from 30 to 50 nm. Photoluminescence emission measurements were recorded in the temperature range from room up to 873 K. The accomplished results demonstrate the performance of Eu3+ and Sm3+ doped Lu2O3 as high temperature thermographic phosphors of very good sensitivity.

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6

Muccillo, R., E. N. S. Muccillo, T. F. Andrade, and O. R. Oliveira. "Thermal analyses of yttrium-doped barium zirconate with phosphor pentoxide, boron oxide and zinc oxide addition." Journal of Thermal Analysis and Calorimetry 130, no. 3 (June 19, 2017): 1791–99. http://dx.doi.org/10.1007/s10973-017-6523-x.

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7

Butusov, Leonid A., Galina K. Chudinova, Margarita V. Kochneva, Vladimir V. Kurilkin, Tatyana F. Sheshko, Alexandra Shulga, Indira A. Hayrullina, and Oleg S. Kudryavtsev. "Fluorescence Properties of Tb-Doped ZnO Porous Network Thin Film Grown on Monocrystalline Silicon Substrate." Materials Science Forum 934 (October 2018): 3–7. http://dx.doi.org/10.4028/www.scientific.net/msf.934.3.

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This research presents a new perspective on optical biosensors based on zinc oxide nanoparticles. The widely known and successfully applied nanostructured material is modified by the dopant - the green phosphor Terbium, which embedded in the structure of zinc oxide and makes a significant contribution to the fluorescent response of the material in both the UV and visible spectral regions. The effect of various dopant concentrations on the fluorescence of nanostructures was studied; the nanostructures were examined by SEM.

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8

KUMAR, DHIRAJ, SUNIL KUMAR, and H. S. BHATTI. "LASER-INDUCED PHOTOLUMINESCENT STUDIES OF Al-DOPED ZINC OXIDE NANOPARTICLES." International Journal of Nanoscience 09, no. 05 (October 2010): 439–45. http://dx.doi.org/10.1142/s0219581x10007101.

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In this paper, addition of aluminum in zinc oxide is incorporated using low-temperature chemical synthesis route. Aluminum ions help in crystallization of zinc oxide nanoparticles. Characterization of the synthesized nanoparticles of zinc oxide has been done using Transmission electron microscope (TEM), and X-ray diffraction (XRD) analysis, Energy-resolved photoluminescence (PL) spectra and Time-resolved laser-induced photoluminescence (TRPL) at room temperature. Transmission electron microscopic observations and X-Ray diffraction studies indicate highly crystalline nature and particle size of the order of 20 nm in ZnO:Al . Time-resolved laser-induced photoluminescence measurements have been done using pulsed nitrogen laser as an excitation source, operated at wavelength 337.1 nm and having high peak output power of 1 MW. The results show that at higher concentrations of Al doping in host ZnO phosphor, emission intensity is more by several orders of magnitude and lifetime shortening indicates that these nanoparticles are more efficient as compared with lower concentrations of dopant.

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9

Ghifari, Najla, Sara Rassouk, Zain Hayat, Abdelhafed Taleb, Adil Chahboun, and Abdel I. El Abed. "Dye-Doped ZnO Microcapsules for High Throughput and Sensitive Optofluidic Micro-Thermometry." Micromachines 11, no. 1 (January 17, 2020): 100. http://dx.doi.org/10.3390/mi11010100.

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The main objective of this work is to show the proof of concept of a new optofluidic method for high throughput fluorescence-based thermometry, which enables the measure of temperature inside optofluidic microsystems at the millisecond (ms) time scale (high throughput). We used droplet microfluidics to produce highly monodisperse microspheres from dispersed zinc oxide (ZnO) nanocrystals and doped them with rhodamine B (RhB) or/and rhodamine 6G (Rh6G). The fluorescence intensities of these two dyes are known to depend linearly on temperature but in two opposite manner. Their mixture enables for the construction of reference probe whose fluorescence does not depend practically on temperature. The use of zinc oxide microparticles as temperature probes in microfluidic channels has two main advantages: (i) avoid the diffusion and the adsorption of the dyes inside the walls of the microfluidic channels and (ii) enhance dissipation of the heat generated by the focused incident laser beam thanks to the high thermal conductivity of this material. Our results show that the fluorescence intensity of RhB decreases linearly with increasing temperature at a rate of about −2.2%/°C, in a very good agreement with the literature. In contrast, we observed for the first time a nonlinear change of the fluorescence intensity of Rh6G in ZnO microparticles with a minimum intensity at a temperature equal to 40 °C. This behaviour is reproducible and was observed only with ZnO microparticles doped with Rh6G.

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10

Li, Chaoyang, Su Wai Htet, and Tetsuya Ueda. "P‐83: Oxygen Ratio's Effect on the Photoluminescence Property of Zinc‐Oxide Thin‐Film Phosphor." SID Symposium Digest of Technical Papers 53, no. 1 (June 2022): 1340–43. http://dx.doi.org/10.1002/sdtp.15759.

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11

Martínez Vargas, David Ricardo, Mariana J. Oviedo, Fabio da Silva Lisboa, Fernando Wypych, Gustavo A. Hirata, and Gregorio Guadalupe Carbajal Arizaga. "Phosphor Dysprosium-Doped Layered Double Hydroxides Exchanged with Different Organic Functional Groups." Journal of Nanomaterials 2013 (2013): 1–8. http://dx.doi.org/10.1155/2013/730153.

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The layers of a Zn/Al layered double hydroxide (LDH) were doped with Dy3+cations. Among some compositions, the Zn2+ : Al3+ : Dy3+molar ratio equal to 30 : 9 : 1 presented a single crystalline phase. Organic anions with carboxylic, amino, sulfate, or phosphate functional groups were intercalated as single layers between LDH layers as confirmed by X-ray diffraction and infrared spectroscopy. Photoluminescence spectra of the nitrate intercalated LDH showed a wide emission band with strong intensity in the yellow region (around 574 nm), originated due to symmetry distortion of the octahedral coordination in dysprosium centers. Moreover, a broad red band emission was also detected apparently due to the presence of zinc oxide. The distorted symmetry of the dysprosium coordination environment, also confirmed by X-ray photoelectron spectroscopy analysis, was modified after the intercalation with phenyl phosphonate (PP), aspartate (Asp), adipate (Adip), and serinate (Ser) anions; the emission as measured from PL spectra of these LDH was more intense in the blue region (ca. 486 nm), thus indicating an increase in symmetry of dysprosium octahedrons. The red emission band from zinc oxide kept the same intensity after intercalation of dodecyl sulfate (DDS). An additional emission of unknown origin atλ= 767 nm was present in all LDHs.

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12

Shvalagin, Vitaliy, Galyna Grodziuk, Olha Sarapulova, Misha Kurmach, Vasyl Granchak, and Valentyn Sherstiuk. "Influence of Nanosized Silicon Oxide on the Luminescent Properties of ZnO Nanoparticles." Journal of Nanotechnology 2016 (2016): 1–7. http://dx.doi.org/10.1155/2016/2708638.

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For practical use of nanosized zinc oxide as the phosphor its luminescence quantum yields should be maximized. The aim of this work was to enhance luminescent properties of ZnO nanoparticles and obtain high-luminescent ZnO/SiO2composites using simpler approaches to colloidal synthesis. The luminescence intensity of zinc oxide nanoparticles was increased about 3 times by addition of silica nanocrystals to the source solutions during the synthesis of ZnO nanoparticles. Then the quantum yield of luminescence of the obtained ZnO/SiO2composites is more than 30%. Such an impact of silica is suggested to be caused by the distribution of ZnO nanocrystals on the surface of silica, which reduces the probability of separation of photogenerated charges between the zinc oxide nanoparticles of different sizes, and as a consequence, there is a significant increase of the luminescence intensity of ZnO nanoparticles. This way of increasing nano-ZnO luminescence intensity facilitates its use in a variety of devices, including optical ultraviolet and visible screens, luminescent markers, antibacterial coatings, luminescent solar concentrators, luminescent inks for security printing, and food packaging with abilities of informing consumers about the quality and safety of the packaged product.

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13

Jia, Lin Yan, Zhong Bao Shao, and Jun Feng Han. "Luminescence Properties of ZnO:Eu³⁺ Red Emitting Phosphor Prepared by Precipitation Method." Advanced Materials Research 690-693 (May 2013): 594–97. http://dx.doi.org/10.4028/www.scientific.net/amr.690-693.594.

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Zinc oxide doped with Eu3+ ions red emitting phosphors were prepared by precipitation method, and its luminescence properties were investigated. The phosphors were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence (PL) spectra. The ZnO:Eu3+ phosphors were obtained at 600°C by calcining precipitation precursor. These phosphors can be effectively excited at 465nm. In emission spectra, the strongest peak at 616nm correlating to red emission is due to the electric dipole transition 5D07F2 of Eu3+ ions. Eu3+ions replaced Zn2+ ions and occupied the non-centrosymmetric sites in the ZnO matrix lattice. The phosphor particles with narrow distribution range are approximately 100-200nm in size. The luminescence properties of ZnO:Eu3+ phosphor with 8 mol% doping concentration of Eu3+ is optimal.

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14

Gopalakrishna Pillai Leela, Bhagyalekshmi, and Deepthi N. Rajendran. "Effect of lanthanide ion co-doping on the luminescence in the cerium-doped zinc oxide-phosphor system." Spectroscopy Letters 52, no. 8 (September 14, 2019): 431–40. http://dx.doi.org/10.1080/00387010.2019.1659824.

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15

Wahab, Siti Aisyah Abdul, Khamirul Amin Matori, Mohd Hafiz Mohd Zaid, Mohd Mustafa Awang Kechik, Sidek Hj Ab Aziz, Rosnita A. Talib, Aisyah Zakiah Khirel Azman, Rahayu Emilia Mohamed Khaidir, Mohammad Zulhasif Ahmad Khiri, and Nuraidayani Effendy. "A Study on Optical Properties of Zinc Silicate Glass-Ceramics as a Host for Green Phosphor." Applied Sciences 10, no. 14 (July 18, 2020): 4938. http://dx.doi.org/10.3390/app10144938.

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For the very first time, a study on the crystallization growth of zinc silicate glass and glass-ceramics was done, in which white rice husk ash (WRHA) was used as the silicon source. In this study, zinc silicate glass was fabricated by using melt–quenching methods based on the composition (ZnO)0.55(WRHA)0.45, where zinc oxide (ZnO) and white rice husk ash were used as the raw materials. The control crystallization technique was used in which the sample was sintered at 700–950 °C; then, the physical, structural, and optical properties of the glass and glass-ceramics were investigated by using a densitometer, linear shrinkage, X-ray diffraction (XRD), Fourier transform infrared radiation (FTIR), field-emission scanning electron microscopy (FESEM), and photoluminescence spectroscopy (PL). The density and linear shrinkage increased as the crystallinity increased and the XRD results showed the progression of the crystal formation, in which the sample was still in an amorphous state at 27 °C and 700 °C; the crystalline phase started at 750 °C. Based on the FTIR spectra, all samples showed sharpened absorption bands as the sintering temperature was increased, and the FESEM image showed the progression of crystal growth, indicating the formation of zinc silicate glass-ceramics. Lastly, the PL spectra emitted three emission peaks, at 529, 570, and 682 nm for the green, yellow, and red emission, respectively.

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16

Bhatia, Vasuda, Leonid K. Karpov, and Mark H. Weichold. "Fabrication and characterization of a monolithic thin-film edge emitter device with zinc–oxide–tungsten-based thin-film phosphor." Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures 22, no. 1 (2004): 165. http://dx.doi.org/10.1116/1.1640400.

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17

Hsu, Chih-Hung, Lung-Chien Chen, and Jia-Ren Wu. "Prepared and Characteristics of ZnO:YAG/Silicon Nanostructure Diodes Prepared by Ultrasonic Spraying." International Journal of Photoenergy 2014 (2014): 1–6. http://dx.doi.org/10.1155/2014/128235.

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This work presents a novel white light source. An yttrium aluminum garnet (YAG) phosphor incorporated zinc oxide (ZnO) (ZnO:YAG) film is deposited on a silicon substrate by ultrasonic spray pyrolysis to form a nanostructure diode. A nanoflower consisting of a hexagonal nanopetal is formed on the surfaces of the silicon substrate. A white broad band at the room temperature photoluminescence ranging from 420 to 650 nm for the ZnO:YAG/silicon nanostructure diode was observed. The white broad band consists of the emissions of defect level transition of the ZnO film and the5D4level to the7F6and7F5level transitions of Ce3+ions.

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18

Santos, N. F., J. Rodrigues, C. Nico, A. J. S. Fernandes, F. M. Costa, and T. Monteiro. "ZnGa2O4:Mn2+ Phosphors Grown by Laser Floating Zone." Microscopy and Microanalysis 18, S5 (August 2012): 105–6. http://dx.doi.org/10.1017/s1431927612013189.

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Cubic zinc gallate (c-ZnGa2O4) has attracted the attention of the scientific community due to its potential phosphor applications, namely in field emission displays (FEDs) and other electroluminescent devices. Among other advantages, this oxide matrix shows superior thermal and chemical stability when compared to ZnS based phosphors. Most of the above mentioned works comprise nanostructures, thin films or pressed pellets while scarce information is found on bulk c-ZnGa2O4 material. In particular, no records were found regarding c-ZnGa2O4 crystal growth by the laser floating zone (LFZ) technique. In this work, crystalline fibres of manganese doped (0.01 mol %) zinc gallate were produced via LFZ in order to investigate its applicability in efficient phosphors. The transition metal ions are suitable activators and show some advantages over the widely used rare earths, namely at environmental and economic levels.

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19

Коverzin, A. M., V. G. Schipizyn, A. V. Vaschenko, A. S. Bliznyukov, M. R. Sadradinov, А. R. Makavetskas, and Yu A. Fischenko. "Study of scull and lining in the hearth of blast furnace No. 2 of JSC EVRAZ ZSMK (Report 2)." Ferrous Metallurgy. Bulletin of Scientific , Technical and Economic Information, no. 9 (September 25, 2018): 9–24. http://dx.doi.org/10.32339/0135-5910-2018-9-9-24.

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Results of study of scull and lining composition from the hearth of blast furnace No. 2 of JSC EVRAZ ZSMK after stop for capital overhaul quoted. It was determined, that due to microprobe chemical analysis data, considerable quantity different minerals and metals can be discovered in the scull and in the lining. But chemical analysis of averaged samples and their X-ray structure analysis allows to state, that the scull is formed during crystallization of heat products – cast iron and slag. Therefore the scull base is the following:– metal, in the content of which α-Fe prevails with iron carbides (Fe3C) inclusions, complicated carbides of variable composition (FeхSiyCz), iron and graphite sulfides and phosphides, as a rule, of laminar structure;– graphite in the form of separate phase;– slag components, melilite and anorthite being the base of them (minerals, formed during crystallization of slag of blast furnace heat).At the level of hot metal tap hole and higher the scull and lining are saturated by alkaline metals accompanied by forming leucite, caliofilite, calcilite, zinc (zinc oxide, ganit, willemite in samples), sulphur with forming of sulphides, phosphor (iron phosphides in metal, apatite in slag). Lower the level of tap hole the number of slag inclusions in the scull is not considerable, zinc and alkaline metals were not discovered.In all the samples content of silicon, silicon carbide, carbides, nitrides, titanium carbonitrides in total does not reach level of 5%.

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20

Ghifari, Najla, Bertrand Cinquin, Adil Chahboun, and Abdel I. El Abed. "Rhodamine B Doped ZnO Monodisperse Microcapsules: Droplet-Based Synthesis, Dynamics and Self-Organization of ZnO Nanoparticles and Dye Molecules." Nanomaterials 10, no. 12 (November 27, 2020): 2351. http://dx.doi.org/10.3390/nano10122351.

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In the present work, droplet-based microfluidics and sol-gel techniques were combined to synthesize highly monodisperse zinc oxide (ZnO) microspheres, which can be doped easily and precisely with dyes, such as rhodamine B (RhB), and whose size can be finely tuned in the 10–30 μm range. The as-synthesized microparticles were analyzed by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and confocal microscopy. The results reveal that the microspheres exhibit an excellent size monodispersity, hollow feature, and a porous shell with a thickness of about 0.6 μm, in good agreement with our calculations. We show in particular by means of fluorescence recovery after photobleaching (FRAP) analysis that the electric charges carried by ZnO nanoparticles primary units play a crucial role not just in the formation and structure of the synthesized ZnO microcapsules, but also in the confinement of dye molecules inside the microcapsules despite a demonstrated porosity of their shell in regards to the solvent (oil). Our results enable also the measurement of the diffusion coefficient of RhB molecules inside the microcapsules (DRhB=3.8×10−8 cm2/s), which is found two order of magnitude smaller than the literature value. We attribute such feature to a strong interaction between dye molecules and the electrical charges carried by ZnO nanoparticles. These results are important for potential applications in micro-thermometry (as shown recently in our previous study), photovoltaics, or photonics such as whispering gallery mode resonances.

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21

Patel, Vikaskumar N., Bapanaiah Penugonda, and Anuja Patel. "Comparative evaluation of radiographic density of different endodontic material." International Journal of Oral Health Dentistry 7, no. 4 (December 15, 2021): 296–98. http://dx.doi.org/10.18231/j.ijohd.2021.058.

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The purpose of this study was to evaluate and compare the densities of four different brands of root canal sealers using three different intraoral imaging receptors. Four different root canal sealers used were – AH Plus (Dentsply Germany, Resin based), Epiphany (Pentron USA, Resin based), U/P (Sultan Healthcare, Zinc oxide eugenol based) and Apexit (Ivoclar / Vivadent, Calcium hydroxide based). The sealers were mixed according to manufacturer instructions and six specimens of each material were fabricated. All the specimens were imaged using three different intraoral #2 sized imaging receptors-D and E speed film and storage phosphor plates. D and E speed films were digitized and stored in JPEG format. All the images were exported into the Image J software (rsb.info.nih.gov/ij/) and the mean grey values and integrated density of each material was calculated from four random areas of each image and averaged. Mixed model ANOVA was performed. Pair wise comparison of mean grey values between the three imaging receptors and integral densities recorded by the receptors showed high statistical significance for all the four different root canal sealers. Results showed that the four different types of root canal sealers showed different optical densities on all the three receptors. The purpose of this study is to evaluate and compare the optical densities of four different brands of root canal sealers using three different intraoral imaging receptors.

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22

Sobti, Jasleen Bombra, V. Bhatia, P. M. Babuchna, and Mark H. Weichold. "Film Preparation Conditions and Characterization of co-Deposited Tungsten Doped Zinc Oxide Phosphor." MRS Proceedings 558 (1999). http://dx.doi.org/10.1557/proc-558-9.

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ABSTRACTNeed for efficient blue light emitting source for optoelectronic device applications such as flat panel displays has made the research in luminescent material ever so important. Tungsten doped zinc oxide (ZnO:W) has been identified as a blue light emitting phosphor exhibiting cathodoluminescence near 490 nm. This paper details work done on ZnO:W phosphor preparation conditions for efficient light emission from the phosphor. Material characterization to identify the possible source of blue light emission will also be discussed.

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23

Sobti, Jasleen Bombra, V. Bhatia, P. M. Babuchna, and Mark H. Weichold. "Film Preparation Conditions and Characterization of Co-Deposited Tungsten Doped Zinc Oxide Phosphor." MRS Proceedings 560 (1999). http://dx.doi.org/10.1557/proc-560-89.

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ABSTRACTNeed for efficient blue light emitting source for optoelectronic device applications such as flat panel displays has made the research in luminescent material ever so important. Tungsten doped zinc oxide (ZnO:W) has been identified as a blue light emitting phosphor exhibiting cathodoluminescence near 490 tim. This paper details work done on ZnO:W phosphor preparation conditions for efficient light emission from the phosphor. Material characterization to identify the possible source of blue light emission will also be discussed.

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24

Feuk, Henrik, Sebastian Nilsson, and Mattias Richter. "Automated Phosphor Thermometry Lifetime Calibration of Multiple Phosphors and Emission Lines to above 1900 K." Measurement Science and Technology, August 31, 2022. http://dx.doi.org/10.1088/1361-6501/ac8e21.

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Abstract A method is specified which enables lifetime calibration of multiple phosphors and emission lines at the same time to temperatures above 1900 K. The experimental setup and algorithm used for data collection and experimental equipment control are described. The phosphors were coated on an alumina oxide disc and the reference temperature was measured using three type B thermocouples. The algorithm automates the data collection process such that no input from an operator is required during operation. The potential systematic error in calibration temperature was evaluated and was less than 1 % around 1400 K.

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25

Li, Rui, George R. Fern, Robert Withnall, Jack Silver, Peter Bishop, and Benedicte Thiebaut. "Incorporation of Luminescent Zinc Oxide Nanoparticles into Polystyrene." MRS Proceedings 1509 (2013). http://dx.doi.org/10.1557/opl.2013.414.

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ABSTRACTZinc oxide (ZnO) nanoparticles and nanoparticles of luminescent zinc oxide (ZnO:Zn) phosphor were successfully synthesised and well characterised. A transparent polystyrene composite sheet containing ZnO:Zn nanoparticles was prepared by a solvent casting method. The sheet manifested comparable transmission to a virgin polystyrene film due to very uniform dispersion of the ZnO:Zn nanoparticles into the polystyrene. Evidence for uniform dispersion was evident in both its luminescent properties and in a SEM image. The photoluminescent characteristics of the ZnO:Zn, both as a pure powder and embedded in a polystyrene matrix, are reported. The uniformity of the photoluminescence of the composite sheet under near ultraviolet excitation is demonstrated. The luminescent ZnO:Zn nanoparticles are shown to have applications for use not only as an inhibitor of the ultraviolet degradation of polymers, but also for providing polymers with light emitting functionality.

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26

"Luminescence Properties of Impurity-Doped Zinc Oxide Phosphor for Novel Neutron Detection." Sensors and Materials, 2016, 905. http://dx.doi.org/10.18494/sam.2016.1358.

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27

Vanheusden, K., W. L. Warren, C. H. Seager, D. R. Tallant, J. Caruso, M. J. Hampden-Smith, and T. T. Kodas. "Nature of the Green Luminescent Center in Zinc Oxide." MRS Proceedings 424 (1996). http://dx.doi.org/10.1557/proc-424-433.

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ABSTRACTWe apply a number of complementary characterization techniques including electron paramagnetic resonance, optical absorption, and photoluminescence spectroscopies to characterize a wide range of different ZnO phosphor powders. We generally observe a good correlation between the 510-nm green emission intensity and the density of paramagnetic isolated oxygen vacancies. In addition, both quantities are found to peak at a free-carrier concentration ne, of about 1.4 × 1018 cm-3. We also find that the green emission intensity can be strongly influenced by free-carrier depletion at the particle surface, especially for small particles and/or low doping. Our data suggest that the green PL in ZnO phosphors is due to the recombination of electrons in singly occupied oxygen vacancies with photoexcited holes in the valence band.

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28

LI, Chaoyang, Yudai Ueno, and Su Wai Htet. "Large Surface Nanostructured Zinc Oxide Thin Film Phosphor Fabrication on Different Conductive Substrates." Proceedings of the International Display Workshops, December 2, 2021, 322. http://dx.doi.org/10.36463/idw.2021.0322.

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29

Wellenius, Patrick, Arun Suresh, and John F. Muth. "An Amorphous IGZO Rare Earth Doped Luminescent Phosphor." MRS Proceedings 1111 (2008). http://dx.doi.org/10.1557/proc-1111-d08-03.

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AbstractIndium gallium zinc oxide (IGZO) has attracted recent attention as a high electron mobility amorphous material for high performance thin film transistors and subsequent use in active matrix backplanes for flexible displays. In this study, Eu:IGZO thin films were pulsed laser deposited at room temperature onto sapphire substrates and were investigated by cathodoluminescence and optical transmission. Photoluminescence was not observed with above band gap excitation. Thin film electroluminescent (TFEL) devices were also fabricated from these thin films. The thin films and devices demonstrate characteristic europium emission, with the most intense emission at 611 nm corresponding to the 5D0 to 7F2 transition. Luminescence was observed to increase with increasing oxygen pressure during deposition of the Eu:IGZO thin films and may be related to the free carrier density in the films. The authors believe this to be the first report of an amorphous oxide electroluminescent phosphor.

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Ollinger, M., V. Craciun, S. Nagore, and R. K. Singh. "Effect of Oxygen Pressure During Zno:Al Coating of Zns:Ag Phosphor on Cathodoluminescent Degradation Lifetime." MRS Proceedings 780 (2003). http://dx.doi.org/10.1557/proc-780-y4.3.

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AbstractThe reduction in cathodoluminescent (CL) degradation of ZnS:Ag phosphor particles coated with aluminum doped zinc oxide (ZAO) films has been investigated. The films were deposited under various oxygen pressures using the atomic flux coating process. The characteristics of the coated phosphor particles with respect to as-received ones were investigated by x-ray photoelectron spectroscopy, CL degradation and scanning electron microscopy. All coated phosphor particles exhibited less CL degradation than the uncoated particles. The coatings deposited under 1.6×10-4 Torr of oxygen, a pressure much lower than the optimum one required to obtain highly transparent and conductive ZnO:Al films, provided the longest brightness lifetime. This increased phosphors lifetime was attributed to the high reactivity of the oxygen deficient ZAO coatings which acted as a sacrificial layer and trapped reactive species before they can reach the phosphor particles and alter their chemical composition.

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31

Ollinger, Michael, Valentin Craciun, and Rajiv K. Singh. "Nano-Encapsulated ZnS:Ag Phosphors for Field Emission Flat Panel Display Applications." MRS Proceedings 704 (2001). http://dx.doi.org/10.1557/proc-704-w8.4.1.

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AbstractZnS:Ag phosphor particles were encapsulated with nano-meter thick films of indium tin oxide (ITO) in order to slow the degradation process of the phosphor as well as to reduce the amount of sulfur species out-gassing from the phosphor. Cathodoluminescent (CL) degradation measurements were performed at two different vacuum conditions (6.1–10-7 Torr and 1–10-5 Torr). The CL degradation curves showed that the ITO coating improved the brightness lifetime. X-ray photoelectron spectroscopy was used to determine the chemical changes on the coated and uncoated degraded particle surfaces. CL images were used to show the loss of brightness from the surface of the phosphor particles. Then energy dispersive x-ray spectroscopy was used to measure the ratio of the area under the zinc and sulfur peaks on an atomic weight %, which showed a loss in sulfur during the degradation experiments.

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32

Lee, Yong Eui, David P. Norton, John D. Budai, Philip D. Rack, Jeffrey Peterson, and Michael D. Potter. "Epitaxial Oxide Thin-Film Phosphors for Low Voltage FED Applications." MRS Proceedings 621 (2000). http://dx.doi.org/10.1557/proc-621-q2.4.1.

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ABSTRACTEpitaxial ZnGa2O4 and Sr2CeO4 thin-film phosphors were successfully grown on (100) MgO, YSZ, and SrTiO3 single crystal substrates using pulsed laser ablation. Cathodoluminescence efficiency was remarkably enhanced by adding lithium in the ZnGa2O4 and ZnGa2O4:Mn for both blue and green light emitting thin-film phosphors. The highest efficiencies, in this experiment, were 0.35 and 0.29 lm/W at 1kV for as-deposited blue and green zinc gallate phosphor films, respectively. In case of Sr2CeO4 films, the highest luminescence was 0.14 lm/W at 1kV and 0.26 A/m2 for films annealed at 1000°C in air.

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33

Rudyk, B. P., B. D. Nechyporuk, O. F. Kolomys, V. V. Strelchuk, V. M. Dzhagan, and V. O. Yukhymchuk. "OPTICAL PROPERTIES OF NANOSIZED ZINC OXIDE OBTAINED BY ELECTROCHEMICAL METHOD." Scientific Bulletin of the Uzhhorod University. Series «Chemistry» 45, no. 1 (June 30, 2021). http://dx.doi.org/10.24144/2414-0260.2021.1.47-52.

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For the synthesis of nanostructured ZnO, the electrolytic method developed by the authors was used, the advantages of which are the environmentally friendly and low-cost process, low synthesis temperatures (20-98°C), and no need for complex equipment. The developed method allows to obtain low-dispersion materials of different elemental composition, in particular, zinc compounds – ZnO and hydrozincite, which were studied in this work. Investigation of the samples by X-ray diffractometry (XRD) showed that the synthesized ZnO is characterized by the hexagonal structure of wurtzite, P63mc, and for hydrozincite – by the monoclinic prismatic structure C2/m. Studies of the synthesized nanocrystals (NC) of ZnO by scanning electron microscopy have shown that they form in the shape of rods and "nanostars", and their concentration increases with increasing electrolyte temperature during synthesis. At the same time, according to XRD, the concentration of hydrozincite in the synthesized powder decreases with increasing electrolyte temperature. It is established that the technological parameters of ZnO synthesis and subsequent annealing significantly affect the photoluminescence (PL) spectra. In particular, the effect of increasing the oxygen concentration in the electrolyte on the PL was investigated. It is shown that purging air through the electrolyte in the process of ZnO synthesis leads to a change in the number of photogenerating defects VO+ and Oi, which is manifested in a change in the intensities of individual PL bands. In particular, an increase in the intensity of ~ 440 nm PL band was registered, which is due to an increase in the number of defects associated with oxygen inclusions (Oi) in the ZnO lattice and the formation of hydrozincite (Zn5(OH)6(CO3)2); the formation of the latter was confirmed by X-ray diffraction. It has been shown that annealing of the powder synthesized with purging with air leads to an increase in the intensity of the exciton ZnO band, which is explained by thermal decomposition of hydrozincite to an "active" ZnO with a well-developed surface. It is demonstrated that the PL of the obtained phosphor based on ZnO NCs covers the entire visible spectrum, which is important for the creation of white light sources. In the resonant Raman spectra (lexcitation = 325 nm) of the annealed ZnO samples, only an A1(LO) first-order optical phonon is manifested at ~ 573 cm-1, and its overtones up to the 4th order, which confirms the high crystalline perfection of the synthesized ZnO material.

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Ortiz-Morales, Alejandro, Manuel García-Hipólito, Epifanio Cruz-Zaragoza, and Ramón Gómez-Aguilar. "Characterization and thermoluminescence study of gamma irradiated Tb-doped ZnO and undoped ZnO synthesized by spray pyrolysis method." Nova Scientia 13, no. 27 (November 22, 2021). http://dx.doi.org/10.21640/ns.v13i27.2877.

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High gamma dose-resistant undoped ZnO and Tb-doped ZnO thermoluminescent (TL) micro-phosphors were prepared by the spray pyrolysis method. Scanning electron microscopy shows crystalline rods with hexagonal morphology, (0.1-0.4 µm diameter, and about 1 µm length). Raman spectra dispersion reveals a würtzite form. Photoluminescence (PL) study of irradiated zinc oxide films indicates the generation of defects produced by gamma irradiation resulting in an increased probability of electron-hole exciton recombination. PL spectrum shows emission bands from 5D4-7Fj=6,5,4,3 transitions ascribed to Tb3+ dopant in zinc oxide phosphor. X-ray diffraction patterns for both types of films growth (undoped ZnO and Tb-doped ZnO) are typical of zinc oxide crystalline structure, with no noticeable effect of Tb ions. Dosimetric properties, for both samples, show a low TL fading signal and TL reproducibility signal for undoped ZnO and Tb-doped ZnO samples was 29 and 57 %, respectively. The kinetic parameters such as activation energy E, frequency factor s, and Rm values, were obtained by Computerized Glow Curve Deconvolution (CGCD) assuming Mixed Order Kinetic model (MOK). The results show that the MOK well described the glow curves of zinc oxide films. The heating rate effects produced a broadening of glow peak located at 420 K. For purposes like radiation detector, atomic effective number (Zeff) was obtained: 27.74 and 56.47 for undoped ZnO and Tb-doped ZnO samples, respectively. The samples were exposed to gamma radiation in a wide range of 0.25–20 kGy dose. TL properties of undoped ZnO and Tb-doped ZnO samples show that these materials could be used to detect high doses in a gamma radiation field.

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35

Li, Y., E. Forsythe, G. S. Tompa, J. Liu, and D. C. Morton. "Photolumineseence, Electroluminescence, and Cathodoluminescence of ZnO:Zn Phosphor Films Prepared by MOCVD." MRS Proceedings 441 (1996). http://dx.doi.org/10.1557/proc-441-615.

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AbstractCathode ray tube (CRT) technology remains the major display component for today's display technologies. The improvements from monochrome displays to today's full color displays have always been accompanied by improvements in the phosphors. The CRT type displays operate at very high voltages (over 10 keV) at relatively low currents, a few microamps/cm2. The phosphors and phosphor coating technology used in CRT based displays have been optimized for operation with these excitation conditions. However, the developments of field emitter displays based on microtip technology, or negative electron affinity technology require phosphors that operate at lower voltages, preferably 10 to 1500 eV at relatively higher current densities. Zn-rich zinc oxide (ZnO:Zn) powders have shown improved low voltage cathodoluminescence (CL) as compared to conventional ZnS based phosphors. ZnO:Zn thin film phosphors for cathodoluminescent displays, compared to conventional powder phosphors, can have the advantages of high electrical and thermal conductivity, high energy saturation limit, and high screen resolution. The photoluminescence (PL), Electroluminescence (EL), and CL from thin ZnO:Zn films were studied. The samples were prepared by Low Pressure Metal Organic Chemical Vapor Deposition (LP MOCVD) and post-annealed at temperatures from 700 °C to 1000 ° C. The PL, EL, and CL spectra have a peak centered at 590 nm that increases with annealing temperatures up to 1000 °C. The CL efficiencies are 0.12 Lm/W at electron voltages and currents as low as 500 V and 64 mA/cm2. The ZnO films have been characterized by X-ray Diffiractometry (XRD), and Sweep Electron Microscope (SEM). These PL, EL, and CL results from ZnO:Zn films show the promise for improved phosphors to meet Field Emitting Device (FED) challenges.

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Steenbakker, Rémy J. L., Jörg P. Feist, Richard G. Wellman, and John R. Nicholls. "Sensor Thermal Barrier Coatings: Remote In Situ Condition Monitoring of EB-PVD Coatings at Elevated Temperatures." Journal of Engineering for Gas Turbines and Power 131, no. 4 (April 10, 2009). http://dx.doi.org/10.1115/1.3077662.

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Thermal barrier coatings (TBCs) are used to reduce the actual working temperature of the high pressure turbine blade metal surface. Knowing the temperature of the surface of the TBC and at the interface between the bondcoat and the thermally grown oxide (TGO) under realistic conditions is highly desirable. As the major life-controlling factors for TBC systems are thermally activated, therefore linked with temperature, this would provide useful data for a better understanding of these phenomena and to assess the remaining lifetime of the TBC. This knowledge could also enable the design of advanced cooling strategies in the most efficient way using minimum amount of air. The integration of an on-line temperature detection system would enable the full potential of TBCs to be realized due to improved precision in temperature measurement and early warning of degradation. This, in turn, will increase fuel efficiency and reduce CO2 emissions. The concept of a thermal-sensing TBC was first introduced by Choy, Feist, and Heyes (1998, “Thermal Barrier Coating With Thermoluminescent Indicator Material Embedded Therein,” U.S. Patent U.S. 6974641 (B1)). The TBC is locally modified so it acts as a thermographic phosphor. Phosphors are an innovative way of remotely measuring temperatures and also other physical properties at different depths in the coating using photo stimulated phosphorescence (Allison and Gillies, 1997, “Remote Thermometry With Thermographic Phosphors: Instrumentation and Applications,” Rev. Sci. Instrum., 68(7), pp. 2615–2650). In this study the temperature dependence of several rare earth doped EB-PVD coatings will be compared. Details of the measurements, the influence of aging, the composition, and the fabrication of the sensing TBC will be discussed in this paper. The coatings proved to be stable and have shown excellent luminescence properties. Temperature detection at ultrahigh temperatures above 1300°C is presented using new types of EB-PVD TBC ceramic compositions. Multilayer sensing TBCs will be presented, which enable the detection of temperatures below and on the surface of the TBC simultaneously.

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