CdSe nanocrystal sensitized photon upconverting film

被引：10
作者：
Rigsby, Emily M. [1 ]
Miyashita, Tsumugi [2 ]
Fishman, Dmitry A. [3 ]
Roberts, Sean T. [4 ]
Tang, Ming L. [1 ]
机构：
[1] Univ Calif Riverside, Dept Chem, Riverside, CA 92521 USA
[2] Univ Calif Riverside, Dept Bioengn, Riverside, CA 92521 USA
[3] Univ Calif Irvine, Dept Chem, Irvine, CA 92697 USA
[4] Univ Texas Austin, Dept Chem, Austin, TX 78712 USA
来源：
RSC ADVANCES | 2021年 / 11卷 / 49期
基金：
美国国家科学基金会;
关键词：
TRIPLET ENERGY-TRANSFER; UP-CONVERSION; CHROMOPHORE; FUSION; LIGHT;
D O I：
10.1039/d1ra06562a
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Here, films using CdSe nanocrystal (NC) triplet photosensitizers in conjunction with diphenylanthracene (DPA) emitters were assembled to address several challenges to practical applications for solution-based photon upconversion. By using poly(9-vinylcarbazole) as a phosphorescent host in this film, volatile organic solvents are eliminated, the spontaneous crystallization of the emitter is significantly retarded, and similar to 1.5% photon upconversion quantum yield (out of a maximum of 50%) is obtained. Transient absorption spectroscopy on nanosecond-to-microsecond time scales reveals this efficiency is enabled by an exceptionally long triplet lifetime of 3.4 +/- 0.3 ms. Ultimately, we find the upconversion efficiency is limited by incomplete triplet-triplet annihilation, which occurs with a rate 3-4 orders of magnitude slower than in solution-phase upconversion systems.
引用
收藏
页码：31042 / 31046
页数：5
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