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Effcient Near-Infrared Quantum Cutting in Tm3+/Yb3 Codoped LiYF4 Single Crystals for Solar Photovoltaic
Li Fu,Hai-ping Xia*,Yan-ming Dong,Shan-shan Li,Xue-mei Gu,Jian-li Zhang,Dong-jie Wang,Hao-chuan Jiang,Bao-jiu Chen
Author NameAffiliationE-mail
Li Fu Key laboratory of Photoelectronic Materials, Ningbo University, Ningbo 315211, China  
Hai-ping Xia* Key laboratory of Photoelectronic Materials, Ningbo University, Ningbo 315211, China hpxcm@nbu.edu.cn 
Yan-ming Dong Key laboratory of Photoelectronic Materials, Ningbo University, Ningbo 315211, China  
Shan-shan Li Key laboratory of Photoelectronic Materials, Ningbo University, Ningbo 315211, China  
Xue-mei Gu Key laboratory of Photoelectronic Materials, Ningbo University, Ningbo 315211, China  
Jian-li Zhang Key laboratory of Photoelectronic Materials, Ningbo University, Ningbo 315211, China  
Dong-jie Wang Key laboratory of Photoelectronic Materials, Ningbo University, Ningbo 315211, China  
Hao-chuan Jiang Ningbo Institute of Materials Technology and Engineering, the Chinese Academy of Sciences, Ningbo 315211, China  
Bao-jiu Chen Department of Physics, Dalian Maritime University, Dalian 116026, China  
Abstract:
Downconversion (DC) with emission of two near-infrared photons about 1000 nm for each blue photon absorbed was obtained in thulium (Tm3+) and ytterbium (Yb3 ) codoped yt-trium lithium fluoride (LiYF4) single crystals grown by an improved Bridgman method. The luminescent properties of the crystals were measured through photoluminescence excitation, emission spectra and decay curves. Luminescence between 960 and 1050 nm from Yb3 : 2F5/22F7/2 transition, which was originated from the DC from Tm3 ions to Yb3 ions, was observed under the excitation of blue photon at 465 nm. Moreover, the energy transfer processes were studied based on the Inokuti-Hirayama model, and the results indicated that the energy transfer from Tm3 to Yb3 was an electric dipole-dipole interaction. The max-imum quantum cutting effciency approached up to 167.5% in LiYF4 single crystal codoped with 0.49mol% Tm3 and 5.99mol% Yb3 . Application of this crystal has prospects for increasing the energy e ciency of crystalline Si solar cells by photon doubling of the high energy part of the solar spectrum
Key words:  Quantum cutting, Energy transfer, LiYF4 single crystals, Tm3+/Yb3
FundProject:
Tm3+/Yb3 :LiYF4单晶的高效近红外量子剪裁及其在光伏电池中的应用
符立,夏海平*,董艳明,李珊珊,谷雪梅,章践立,王冬杰,江浩川,陈宝玖
摘要:
采用改进的坩埚下降法成功地生长了Tm/Yb共掺氟化钇锂单晶. 该单晶体具有每吸收一个蓝色光子并能发射出2个1000 nm近红外光子的下转换发光效应. 测定了样品的激发光谱、发射光谱和荧光衰减曲线. 在465 nm蓝光激发下观察到由Yb3+2F5/22F7/2能级跃迁所致的960~1050 nm 波段的发射带,此发光带源于Tm3 对Yb3 离子的能量下转换过程. 应用Inokuti-Hirayama模型,研究了晶体的能量转换过程,结果表明Tm3 向Yb3 的能量传递是一个电偶极子相互作用机制过程. 当Tm3 与Yb3 离子的掺杂浓度为0.49mol%与5.99mol%时,单晶的量子剪裁效率达到最大值167.5%.
关键词:  量子剪裁,能量传递,LiYF4单晶,Tm3+/Yb3
DOI:10.1063/1674-0068/28/cjcp1407115
分类号: