Artykuły w czasopismach: „EARTH ION DOPED”

1

HU, Qiang, Xue BAI i Hong-wei SONG. "Rare Earth Ion Doped Perovskite Nanocrystals". Chinese Journal of Luminescence 43, nr 01 (2022): 8–25. http://dx.doi.org/10.37188/cjl.20210330.

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Hu, Qingsong, Zha Li, Zhifang Tan, Huaibing Song, Cong Ge, Guangda Niu, Jiantao Han i Jiang Tang. "Rare Earth Ion-Doped CsPbBr3 Nanocrystals". Advanced Optical Materials 6, nr 2 (18.12.2017): 1700864. http://dx.doi.org/10.1002/adom.201700864.

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He, Qingyun, Xingqiang Liu, Feng Li, Fang Li, Leiming Tao i Changlin Yu. "Effect of Light and Heavy Rare Earth Doping on the Physical Structure of Bi2O2CO3 and Their Performance in Photocatalytic Degradation of Dimethyl Phthalate". Catalysts 12, nr 11 (22.10.2022): 1295. http://dx.doi.org/10.3390/catal12111295.

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In order to solve the problem of environmental health hazards caused by phthalate esters, a series of pure Bi2O2CO3 and light (La, Ce, Pr, Nd, Sm and Eu) and heavy (Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu) rare earth-doped Bi2O2CO3 samples were prepared by hydrothermal method. The crystalline phase composition and physical structure of the samples calcined at 300 °C were studied, and we found that the rare earth ion doping promoted the transformation of Bi2O2CO3 to β-Bi2O3 crystalline phase, thus obtaining a mixed crystal phase photocatalyst constituted by rare earth-ion-doped Bi2O2CO3/β-Bi2O3. The Bi2O3/Bi2O2CO3 heterostructure had a lower band gap and more efficient charge transfer. The fabricated samples were applied to the photocatalytic degradation of dimethyl phthalate (DMP) under a 300 W tungsten lamp, and it was found that the rare earth ion doping enhanced the photocatalytic degradation activity of DMP, in which the heavy rare earth of Er-doped sample reached 78% degradation for DMP at 150 min of light illumination. In addition, the doping of rare earths resulted in a larger specific surface area and a stronger absorption of visible light. At the same time, the formation of Bi2O2CO3/β-Bi2O3 heterogeneous junction enhanced the separation efficiency of photogenerated electrons and holes.

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Geburt, S., D. Stichtenoth, S. Müller, W. Dewald, C. Ronning, J. Wang, Y. Jiao, Y. Y. Rao, S. K. Hark i Quan Li. "Rare Earth Doped Zinc Oxide Nanowires". Journal of Nanoscience and Nanotechnology 8, nr 1 (1.01.2008): 244–51. http://dx.doi.org/10.1166/jnn.2008.n05.

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Zinc oxide (ZnO) nanowires were grown via thermal transport and subsequently doped with different concentrations of Tm, Yb, and Eu using ion implantation and post annealing. High ion fluences lead to morphology changes due to sputtering; however, freestanding nanowires become less damaged compared to those attached to substrates. No other phases like rare earth (RE) oxides were detected, no amorphization occurs in any sample, and homogeneous doping with the desired concentrations was achieved. Photoluminescence measurements demonstrate the optical activation of trivalent RE-elements and the emission of the characteristic intra-4f-luminescence of the respective RE atoms, which could be assigned according to the Dieke-diagram. An increasing RE concentration results into decreasing luminescence intensity caused by energy transfer mechanisms to non-radiative remaining implantation defect sites. Furthermore, low thermal quenching was observed due to the considerable wide band gap of ZnO.

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Narayan, Himanshu, Hailemichael Alemu, Lijeloang Setofolo i Lebohang Macheli. "Visible Light Photocatalysis with Rare Earth Ion-Doped Nanocomposites". ISRN Physical Chemistry 2012 (1.03.2012): 1–9. http://dx.doi.org/10.5402/2012/841521.

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Rare earth (R) ion-doped TiO2 nanocomposites (NCs) with general composition (R: Y, Yb, Gd; , 0.2) were synthesized through co-precipitation/hydrolysis (CPH). NC particles with average size of approximately a few tens of nm were obtained. Similar compositions of polycrystalline (PC) samples with larger particle size were also prepared employing solid state reaction (SSR) method. Visible light photocatalytic activity of all samples was investigated for degradation of Congo red (CR) dye. Both in terms of apparent rate constant () and percent degradation after 180 min (), all NCs produced significantly enhanced degradation as compared to pure TiO2 and PC samples. Best degradation of 95% ( value) resulted with composition of Y3+ doped NC with min−1. This was followed by of 85 and 80%, produced with Yb3+ and Gd3+ doped, NCs, at around and min−1, respectively. The observations clearly suggest that enhanced photocatalytic degradation of CR is directly related to smaller particle size of the catalysts. Moreover, the presence of rare earth ions in the composites facilitates further improvement of degradation efficiency through effective suppression of recombination.

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Jaque, D., J. J. Romero, M. O. Ramirez, J. A. Sanz García, C. De Las Heras, L. E. Bausá i J. García Solé. "Rare Earth Ion Doped Non Linear Laser Crystals". Radiation Effects and Defects in Solids 158, nr 1-6 (styczeń 2003): 231–39. http://dx.doi.org/10.1080/1042015021000052197.

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Zhang, Xin, Yuan-Yuan Huang, Jian-Kai Cheng, Yuan-Gen Yao, Jian Zhang i Fei Wang. "Alkaline earth metal ion doped Zn(ii)-terephthalates". CrystEngComm 14, nr 14 (2012): 4843. http://dx.doi.org/10.1039/c2ce25440a.

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Zumofen, G., F. R. Graf, A. Renn i U. P. Wild. "Pulse propagation in rare-earth ion doped crystals". Journal of Luminescence 83-84 (listopad 1999): 379–83. http://dx.doi.org/10.1016/s0022-2313(99)00129-5.

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Guo, Hai, Ning Dong, Min Yin, Weiping Zhang, Liren Lou i Shangda Xia. "Visible Upconversion in Rare Earth Ion-Doped Gd2O3Nanocrystals". Journal of Physical Chemistry B 108, nr 50 (grudzień 2004): 19205–9. http://dx.doi.org/10.1021/jp048072q.

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Wang, Xiangfu, Qing Liu, Yanyan Bu, Chun-Sheng Liu, Tao Liu i Xiaohong Yan. "Optical temperature sensing of rare-earth ion doped phosphors". RSC Advances 5, nr 105 (2015): 86219–36. http://dx.doi.org/10.1039/c5ra16986k.

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Optical temperature sensing is a promising method to achieve the contactless temperature measurement and large-scale imaging. The current status of optical thermometry of rare-earth ions doped phosphors is reviewed in detail.

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OKAMOTO, SHINJI, SHOSAKU TANAKA i HAJIME YAMAMOTO. "ENERGY-TRANSFER PROCESS IN RARE-EARTH-ION DOPED SrTiO3". International Journal of Modern Physics B 15, nr 28n30 (10.12.2001): 3924–27. http://dx.doi.org/10.1142/s0217979201009013.

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Enhancement of emission intensity of rare-earth-ion doped SrTiO 3 by Al addition has been investigated. In the case of Pr 3+ and Tb 3+, addition of 23-mol% Al intensifies emission by more than 200 times. In contrast, the addition of 20 mol% Al intensifies emission at most by three times in the case of other rare-earth ions. The temperature dependence of PL spectra shows that the energy transfer from carriers to Pr 3+ or Tb 3+ ions is much more efficient than that to other rare-earth ions in SrTiO 3. It can be speculated that the energy transfer in SrTiO 3: Pr 3 or Tb 3+ occurs from carriers to Pr 3+ or Tb 3+ ion via 4f-5d transitions, which are much higher in oscillator strength than 4f-4f transitions.

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12

Liu, Wen Bin, Adu, Yu Guang Lv, Li Li Yu, Yong Xiang Du, Wei E. Wang, Chao Xing Wang i in. "Preparation and Luminescent Properties of the La³⁺ Doped Tb³⁺-Hydroxyapatite". Applied Mechanics and Materials 716-717 (grudzień 2014): 32–35. http://dx.doi.org/10.4028/www.scientific.net/amm.716-717.32.

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In this paper, a rare earth metal terbium ion as the central metal ion, a nanohydroxyapatite powder of the lanthanum doped terbium was synthesis by precipitation with hydroxyapatite as ligand. The sample was characterized by infrared spectrum, fluorescence spectrum and X ray diffraction instrument, and the thermal properties and fluorescence properties, structure of powderes were discussed. A nanohydroxyapatite powder of the lanthanum doped terbium achieves the maximum luminous intensity, when the La3+ doping concentration of Tb3+ was HAP 5% (La3+ and Tb3+ mole fraction ratio) devices. Rare earth powder of the lanthanum doped terbium hydroxyapatite has the stability chemical properties, the luminescence properties and good biological activity, the rare earth powder has good luminescent properties can be used in preparation of a good light emitting device. At the same time a nanohydroxyapatite powder of the lanthanum doped terbium has good antibacterial property, can be used as antibacterial materials.

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Nilsson, Johan O., Mikael Leetmaa, Olga Yu Vekilova, Sergei I. Simak i Natalia V. Skorodumova. "Oxygen diffusion in ceria doped with rare-earth elements". Physical Chemistry Chemical Physics 19, nr 21 (2017): 13723–30. http://dx.doi.org/10.1039/c6cp06460d.

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Chen, Ziyu, Hang Zhu, Jiajie Qian, Zhenxiong Li, Xiameng Hu, Yuao Guo, Yuting Fu i in. "Rare Earth Ion Doped Luminescent Materials: A Review of Up/Down Conversion Luminescent Mechanism, Synthesis, and Anti-Counterfeiting Application". Photonics 10, nr 9 (5.09.2023): 1014. http://dx.doi.org/10.3390/photonics10091014.

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With the rapid development of modern technology and information systems, optical anti-counterfeiting and encryption have recently attracted considerable attention. The demand for optical materials is also constantly increasing, with new requirements proposed for performance and application fields. Currently, rare earth ion doped materials possess a unique electronic layer structure, underfilled 4f5d electronic configuration, rich electronic energy level, and long-life excited state, which can produce a variety of radiation absorption and emission. The distinctive properties of rare earth are beneficial for using in diverse optical output anti-counterfeiting. Design is essential for rare earth ion doped materials with multiple responsiveness and multi-channel optical information anti-counterfeiting in the field of information security. Therefore, this mini review summarizes the luminescent mechanisms, preparation methods, performance characteristics and anti-counterfeiting application of rare earth doped materials. In addition, we discuss some critical challenges in this field, and potential solutions that have been or are being developed to overcome these challenges.

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15

Chen, Xueyuan, i Wenqin Luo. "Optical Spectroscopy of Rare Earth Ion-Doped TiO2 Nanophosphors". Journal of Nanoscience and Nanotechnology 10, nr 3 (1.03.2010): 1482–94. http://dx.doi.org/10.1166/jnn.2010.2034.

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Hendriks, Ward A. P. M., Lantian Chang, Carlijn I. van Emmerik, Jinfeng Mu, Michiel de Goede, Meindert Dijkstra i Sonia M. Garcia-Blanco. "Rare-earth ion doped Al2O3 for active integrated photonics". Advances in Physics: X 6, nr 1 (14.12.2020): 1833753. http://dx.doi.org/10.1080/23746149.2020.1833753.

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Hua, Yi-Lin, Zong-Quan Zhou, Chuan-Feng Li i Guang-Can Guo. "Quantum light storage in rare-earth-ion-doped solids". Chinese Physics B 27, nr 2 (luty 2018): 020303. http://dx.doi.org/10.1088/1674-1056/27/2/020303.

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Abou-Helal, M. O., i W. T. Seeber. "Rare earth ion doped semiconducting films by spray pyrolysis". Journal of Non-Crystalline Solids 218 (wrzesień 1997): 139–45. http://dx.doi.org/10.1016/s0022-3093(97)00200-7.

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Pollnau, Markus. "Rare-Earth-Ion-Doped Channel Waveguide Lasers on Silicon". IEEE Journal of Selected Topics in Quantum Electronics 21, nr 1 (styczeń 2015): 414–25. http://dx.doi.org/10.1109/jstqe.2014.2351811.

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Mita, Yoh, Masahiro Togashi i Hajime Yamamoto. "Energy transfer processes in rare-earth-ion-doped materials". Journal of Luminescence 87-89 (maj 2000): 1026–28. http://dx.doi.org/10.1016/s0022-2313(99)00518-9.

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Altner, S. B., G. Zumofen, U. P. Wild i M. Mitsunaga. "Photon-echo attenuation in rare-earth-ion-doped crystals". Physical Review B 54, nr 24 (15.12.1996): 17493–507. http://dx.doi.org/10.1103/physrevb.54.17493.

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LIU, Hong-gang, Jian-hao CHEN, Zi-fan XIAO, Wen-liang PING i Guo-ping DONG. "Research Progress in Rare Earth Ion-doped Microcavity Lasers". Chinese Journal of Luminescence 43, nr 11 (2022): 1663–77. http://dx.doi.org/10.37188/cjl.20220161.

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Zako, Tamotsu, Miya Yoshimoto, Hiroshi Hyodo, Hidehiro Kishimoto, Masaaki Ito, Kazuhiro Kaneko, Kohei Soga i Mizuo Maeda. "Cancer-targeted near infrared imaging using rare earth ion-doped ceramic nanoparticles". Biomaterials Science 3, nr 1 (2015): 59–64. http://dx.doi.org/10.1039/c4bm00232f.

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Cancer-specific NIR–NIR imaging was demonstrated using streptavidin-functionalized rare earth ion-doped yttrium oxide nanoparticles and biotinylated antibodies on cancer cells and human colon cancer tissues.

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Zhang, Jia, Jiajun Chen i Yining Zhang. "Temperature-sensing luminescent materials La9.67Si6O26.5:Yb3+–Er3+/Ho3+ based on pump-power-dependent upconversion luminescence". Inorganic Chemistry Frontiers 7, nr 24 (2020): 4892–901. http://dx.doi.org/10.1039/d0qi01058h.

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OHTA, Masatoshi, Shigeaki KUROI i Masakazu SAKAGUCHI. "ESR Study of X-Ray Irradiated Rare Earth(Ln) Ion-doped Glaserite and Ln Ion-doped Langbeinite." RADIOISOTOPES 41, nr 6 (1992): 302–7. http://dx.doi.org/10.3769/radioisotopes.41.6_302.

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Xiao, Ping, Yongquan Guo, Mijie Tian, Qiaoji Zheng, Na Jiang, Xiaochun Wu, Zhiguo Xia i Dunmin Lin. "Improved ferroelectric/piezoelectric properties and bright green/UC red emission in (Li,Ho)-doped CaBi4Ti4O15 multifunctional ceramics with excellent temperature stability and superior water-resistance performance". Dalton Transactions 44, nr 39 (2015): 17366–80. http://dx.doi.org/10.1039/c5dt02728d.

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Boden, Stuart A., Thomas M. W. Franklin, Larry Scipioni, Darren M. Bagnall i Harvey N. Rutt. "Ionoluminescence in the Helium Ion Microscope". Microscopy and Microanalysis 18, nr 6 (grudzień 2012): 1253–62. http://dx.doi.org/10.1017/s1431927612013463.

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AbstractIonoluminescence (IL) is the emission of light from a material due to excitation by an ion beam. In this work, a helium ion microscope (HIM) has been used in conjunction with a luminescence detection system to characterize IL from materials in an analogous way to how cathodoluminescence (CL) is characterized in a scanning electron microscope (SEM). A survey of the helium ion beam induced IL characteristics, including images and spectra, of a variety of materials known to exhibit CL in an SEM is presented. Direct band-gap semiconductors that luminesce strongly in the SEM are found not do so in the HIM, possibly due to defect-related nonradiative pathways created by the ion beam. Other materials do, however, exhibit IL, including a cerium-doped garnet sample, quantum dots, and rare-earth doped LaPO4 nanocrystals. These emissions are a result of transitions between f electron states or transitions across size dependent band gaps. In all these samples, IL is found to decay with exposure to the beam, fitting well to double exponential functions. In an exploration of the potential of this technique for biological tagging applications, imaging with the IL emitted by rare-earth doped LaPO4 nanocrystals, simultaneously with secondary electron imaging, is demonstrated at a range of magnifications.

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Caldiño, Ulises, Marco Bettinelli, Maurizio Ferrari, Elisa Pasquini, Stefano Pelli, Adolfo Speghini i Giancarlo C. Righini. "Rare Earth Doped Glasses for Displays and Light Generation". Advances in Science and Technology 90 (październik 2014): 174–78. http://dx.doi.org/10.4028/www.scientific.net/ast.90.174.

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Glasses are very versatile materials, also because of the ease of doping them with various elements and compounds. In particular, rare-earth-doped glasses have greatly contributed to the development of optical amplifiers, lasers, active optical waveguides and white-light-emitting devices. White light emitting diodes (W-LEDs) and color LEDS obtained by the combination of an UV emitting LED, such as AlGaN-based LED, with a glass phosphor exhibit very interesting properties. In the present contribution we report the luminescence characteristics of zinc-sodium-aluminosilicates glasses variously doped, namely either singly doped with Eu3+, Tb3+or Sm3+, or co-doped with Tb3+-Eu3+, Tb3+-Sm3+and Tb3+-Ce3+. These glasses have also proved to be suitable for ion exchange and therefore for the production of active optical waveguides.

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Li, Linhao, Joe Kler, Anthony R. West, Roger A. De Souza i Derek C. Sinclair. "High oxide-ion conductivity in acceptor-doped Bi-based perovskites at modest doping levels". Physical Chemistry Chemical Physics 23, nr 19 (2021): 11327–33. http://dx.doi.org/10.1039/d1cp01120k.

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High oxide ion conductivity is achieved in A-site alkaline earth doped BiFeO₃ at modest levels. The similar levels of conductivity suggest oxide–ion conduction in Bi-based tilted perovskites is beyond a simple radius-based crystallochemical approach.

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Gao, Wei, Hairong Zheng, Qingyan Han, Enjie He i Ruibo Wang. "Unusual upconversion emission from single NaYF4:Yb3+/Ho3+ microrods under NIR excitation". CrystEngComm 16, nr 29 (2014): 6697–706. http://dx.doi.org/10.1039/c4ce00627e.

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Tsukiyama, Keishi, Mihiro Takasaki, Naoto Kitamura, Yasushi Idemoto, Yuya Oaki, Minoru Osada i Hiroaki Imai. "Enhanced oxide-ion conductivity of solid-state electrolyte mesocrystals". Nanoscale 11, nr 10 (2019): 4523–30. http://dx.doi.org/10.1039/c8nr09709g.

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Wang, Zhi, Xu Li, Mingyang Li, Jinxing Zhao, Zhenyang Liu, Dawei Wang, Li Guan i Fenghe Wang. "Two-site occupancy induced the broad-band emission in the Ba_4−x−ySr_yLa₆O(SiO₄)₆:xEu²⁺ phosphor for white LEDs and anti-counterfeiting". Dalton Transactions 51, nr 11 (2022): 4414–22. http://dx.doi.org/10.1039/d1dt04059f.

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Ghosh, Pushpal, Rahul Kumar Sharma, Yogendra Nath Chouryal i Anja-Verena Mudring. "Size of the rare-earth ions: a key factor in phase tuning and morphology control of binary and ternary rare-earth fluoride materials". RSC Advances 7, nr 53 (2017): 33467–76. http://dx.doi.org/10.1039/c7ra06741k.

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An IL based solvothermal route to prepare RE ion doped luminescent binary/ternary fluoride nanomaterials. Size of the RE ions tunes the nature of the product, crystal phase, lattice strain and morphology, effecting the luminescence properties.

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Ram, Pura, Attila Gören, Stanislav Ferdov, Maria M. Silva, Rahul Singhal, Carlos M. Costa, Rakesh K. Sharma i Senentxu Lanceros-Méndez. "Improved performance of rare earth doped LiMn2O4cathodes for lithium-ion battery applications". New Journal of Chemistry 40, nr 7 (2016): 6244–52. http://dx.doi.org/10.1039/c6nj00198j.

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Fan Gongqi, 范供齐, 林海凤 Lin Haifeng, 施丰华 Shi Fenghua, 徐文飞 Xu Wenfei i 王海波 Wang Haibo. "Luminescence Properties of Tungstate Phosphors Doped with Rare-Earth Ion". Laser & Optoelectronics Progress 49, nr 3 (2012): 031602. http://dx.doi.org/10.3788/lop49.031602.

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Chang, Hongjin, Juan Xie, Baozhou Zhao, Botong Liu, Shuilin Xu, Na Ren, Xiaoji Xie, Ling Huang i Wei Huang. "Rare Earth Ion-Doped Upconversion Nanocrystals: Synthesis and Surface Modification". Nanomaterials 5, nr 1 (25.12.2014): 1–25. http://dx.doi.org/10.3390/nano5010001.

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Lin, H., E. Y. B. Pun, B. J. Chen i Y. Y. Zhang. "Rare-earth ion doped lead- and cadmium-free bismuthate glasses". Journal of Applied Physics 103, nr 5 (marzec 2008): 056103. http://dx.doi.org/10.1063/1.2891252.

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Zhao, Lijun, Hua Yang, Xueping Zhao, Lianxiang Yu, Yuming Cui i Shouhua Feng. "Magnetic properties of CoFe2O4 ferrite doped with rare earth ion". Materials Letters 60, nr 1 (styczeń 2006): 1–6. http://dx.doi.org/10.1016/j.matlet.2005.07.017.

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You-Hua, Jia, Zhong Biao, Ji Xian-Ming i Yin Jian-Ping. "Enhanced Laser Cooling of Rare-Earth-Ion-Doped Composite Material". Chinese Physics Letters 25, nr 10 (październik 2008): 3779–82. http://dx.doi.org/10.1088/0256-307x/25/10/071.

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Chen, G. Y., Y. G. Zhang, G. Somesfalean, Z. G. Zhang, Q. Sun i F. P. Wang. "Two-color upconversion in rare-earth-ion-doped ZrO2 nanocrystals". Applied Physics Letters 89, nr 16 (16.10.2006): 163105. http://dx.doi.org/10.1063/1.2363146.

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John, Rita, i Rajaram Rajakumari. "Synthesis and Characterization of Rare Earth Ion Doped Nano ZnO". Nano-Micro Letters 4, nr 2 (czerwiec 2012): 65–72. http://dx.doi.org/10.1007/bf03353694.

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Okumura, Miwa, Masaaki Tamatani, Ariane K. Albessard i Naotoshi Matsuda. "Luminescence Properties of Rare Earth Ion-Doped Monoclinic Yttrium Sesquioxide". Japanese Journal of Applied Physics 36, Part 1, No. 10 (15.10.1997): 6411–15. http://dx.doi.org/10.1143/jjap.36.6411.

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Aminov, L. K., i I. N. Kurkin. "Rare-earth ion clusters in doped crystals with fluorite structure". Physics of the Solid State 51, nr 4 (kwiecień 2009): 741–43. http://dx.doi.org/10.1134/s1063783409040143.

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PATEL, DARAYAS, CALVIN VANCE, NEWTON KING, MALCOLM JESSUP, LEKARA GREEN i SERGEY SARKISOV. "STRONG VISIBLE UPCONVERSION IN RARE EARTH ION-DOPED NaYF4 CRYSTALS". Journal of Nonlinear Optical Physics & Materials 19, nr 02 (czerwiec 2010): 295–301. http://dx.doi.org/10.1142/s0218863510005133.

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NaYF 4: Er 3+, Yb 3+ crystals were prepared by simple synthetic method. Under 980 nm laser excitation, 408 nm, 539 nm and 655 nm upconversion emissions were recorded. Laser power and signal intensities of the upconverted emissions were obtained to understand the upconversion mechanisms.

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Crozatier, V., G. Gorju, F. Bretenaker, J. L. Le Gouët, I. Lorgeré i E. Baldit. "Photon echoes in an amplifying rare-earth-ion-doped crystal". Optics Letters 30, nr 11 (1.06.2005): 1288. http://dx.doi.org/10.1364/ol.30.001288.

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Hong, Shi, i Lun Wang. "Up/downconversion luminescence rare-earth ion-doped Y2O3 1D nanocrystals". Science China Chemistry 55, nr 7 (11.02.2012): 1242–46. http://dx.doi.org/10.1007/s11426-012-4509-x.

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Lei, Bingfu, Yingliang Liu, Junwen Zhang, Jianxin Meng, Shiqing Man i Shaozao Tan. "Persistent luminescence in rare earth ion-doped gadolinium oxysulfide phosphors". Journal of Alloys and Compounds 495, nr 1 (kwiecień 2010): 247–53. http://dx.doi.org/10.1016/j.jallcom.2010.01.141.

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Wang, Hai-Qiao, Miroslaw Batentschuk, Andres Osvet, Luigi Pinna i Christoph J. Brabec. "Rare-Earth Ion Doped Up-Conversion Materials for Photovoltaic Applications". Advanced Materials 23, nr 22-23 (21.04.2011): 2675–80. http://dx.doi.org/10.1002/adma.201100511.

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Geskus, Dimitri, Shanmugam Aravazhi, Sonia M. García-Blanco i Markus Pollnau. "Giant Optical Gain in a Rare-Earth-Ion-Doped Microstructure". Advanced Materials 24, nr 10 (24.10.2011): OP19—OP22. http://dx.doi.org/10.1002/adma.201101781.

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Gregorkiewicz, T., i J. M. Langer. "Lasing in Rare-Earth-Doped Semiconductors: Hopes and Facts". MRS Bulletin 24, nr 9 (wrzesień 1999): 27–32. http://dx.doi.org/10.1557/s0883769400053033.

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Semiconductors doped with rare-earth (RE) elements have attracted a lot of attention as alternative materials for producing electrically pumpe d semiconductor lasers whose emission wavelength is very weakly dependent on temperature. This prospect is especially attractive in the case of indirect-gap Silicon, whose photonic applications as the material for light emitters still remain more of a hope than a reality. In view of a desirable emission wavelength at 1.5 μm, a lot of research has concentrated on Si:Er (see Coffa et al. for a recent review). It is generally recognized that doping with Er ions presents one of the most promising approaches to Silicon photonics. However, despiteintensive investigations, stimulated emission has not been conclusively demonstrated for Si.Er or for any other RE-doped semiconductor. This is in striking contrast to optical amplifiers and lasers based on various erbium-doped glasses. In this article, which builds on recent articles in MRS Bulletin on Silicon photonics, we will address the issues relevant to efficient light generation by semiconductors doped with RE elements in general, and specifically by Si:Er-based structures.The intraimpurity electronic structure of RE ions is dominate d by electron-electron and spin-orbit interactions within the 4f shell. In the case of Er3+, they produce separated J-multiplets with 4I15/2 and 4I13/2 as the ground and the lowest-lying excited states, respectively. Due to the effective Screening of 4f electrons by the outer electron Shells, the host has a very limited influence and changes only slightly the relative positions of the levels. Depending on a particular site symmetry, the even terms of the crystal field split the free-ion J-multiplets into the Stark components typically by several meV for the ground State. The energy-level diagram of an Er3+ ion in a cubic crystal field is shown in Figure 1, where the energy transfer paths relevant for Si:Er are also schematically indicated. The odd terms of the crystal field potential admix the states of opposite parity to the 4f11 configuration of the Er3+ ion, thereby introducing a certain degree of electric-dipole strength into the otherwise forbidden intra-4f-shell transitions. This effect enhance s slightly the magnetic-dipole strength of the 4I15/2 ↔ 4I13/2 transition and is host- and site-dependent. There-fore, Er-related center s of different microstructure can be fairly easily identified.

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