2017年10月23日
High-Performance CsPb1−xSnxBr3 Perovskite Quantum Dots for Light-Emitting Diodes
Angewandte Chemie - International Edition
- 巻
- 56
- 号
- 44
- 開始ページ
- 13650
- 終了ページ
- 13654
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1002/anie.201706860
- 出版者・発行元
- Wiley-VCH Verlag
All inorganic CsPbBr3 perovskite quantum dots (QDs) are potential emitters for electroluminescent displays. We have developed a facile hot-injection method to partially replace the toxic Pb2+ with highly stable Sn4+. Meanwhile, the absolute photoluminescence quantum yield of CsPb1−xSnxBr3 increased from 45 % to 83 % with SnIV substitution. The transient absorption (TA) exciton dynamics in undoped CsPbBr3 and CsPb0.67Sn0.33Br3 QDs at various excitation fluences were determined by femtosecond transient absorption, time-resolved photoluminescence, and single-dot spectroscopy, providing clear evidence for the suppression of trion generation by Sn doping. These highly luminescent CsPb0.67Sn0.33Br3 QDs emit at 517 nm. A device based on these QDs exhibited a luminance of 12 500 cd m−2, a current efficiency of 11.63 cd A−1, an external quantum efficiency of 4.13 %, a power efficiency of 6.76 lm w−1, and a low turn-on voltage of 3.6 V, which are the best values among reported tin-based perovskite quantum-dot LEDs.
- ID情報
-
- DOI : 10.1002/anie.201706860
- ISSN : 1521-3773
- ISSN : 1433-7851
- SCOPUS ID : 85031730681