上海理工大学 光电信息与计算机工程学院，上海 200093
铯铅卤化物钙钛矿纳米晶是光伏和发光应用领域中理想化的三线态敏化材料，具有较高的荧光量子产率和量子限域效应。以三层厚度的CsPbBr3纳米片（NPLs）为三线态给体，实现了从NPLs到1-萘甲酸（NCA）分子的高效三线态能量传递（TET）。CsPbBr3 NPLs采用配体辅助再沉淀方法制备，其与NCA分子结合后，稳态荧光被大幅淬灭，荧光寿命从复合前的6.743 ns缩短到0.995 ns，TET效率达到85.3%。通过与大尺寸纳米立方体对比发现，对于CsPbBr3-多环芳烃复合体系，量子限域效应是获得高效TET的关键。研究结果表明，CsPbBr3 NPLs作为三线态敏化剂，可应用在基于TET的光子上转换、光催化氧化-还原反应和室温磷光等领域。
CsPbBr3 纳米片 三线态能量传递 CsPbBr3 nanoplatelets triplet energy transfer
Author Affiliations
Abstract
Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800
Er^(3+)-doped fluoride lanthanum aluminosilicate glasses with compositions of (65-x/2)SiO_(2).(25-x/2)Al_(2)O_(3).xAlF_(3).9.1La_(2)O_(3).0.6Er_(2)O_(3).0.3Yb_(2)O_(3) (x = 4, 8, 12, 20, 30) (mol%) were prepared and their glass transitiontemperatures and spectroscopic properties were investigated. The Ω_(2), Ω_(4), and Ω_(6) intensity parameters of glasses were calculated by Judd-Ofelt theory from absorption curves. It was found that glasses transition temperature and melting temperature decreased with the increase of fluoride content in glass, Ω_(2) decreased gradually with the increase of AlF_(3) content, but both Ω_(4) and Ω_(6) did not increase until AlF_(3) content increased to 30 mol%. The quantum efficiency of ^(4)I_(13/2) to ^(4)I_(15/2) transition of Er^(3+) ions increases with the increase of AlF_(3) content in glass. Fluorescent lifetime is longer in glass containing more AlF_(3) content.
160.2750 glass and other amorphous materials 160.5690 rare earth doped materials Chinese Optics Letters
2004, 2(4): 04229
