3 years ago

High-Performance CsPb1−xSnxBr3 Perovskite Quantum Dots for Light-Emitting Diodes

High-Performance CsPb1−xSnxBr3 Perovskite Quantum Dots for Light-Emitting Diodes
Ru-Shi Liu, Shuming Chen, Yoshihiko Kanemitsu, Weigao Wang, Naoki Yarita, Zhen Bao, Toshiyuki Ihara, An-Cih Tang, Hirokazu Tahara, Hung-Chia Wang, Hsin-Yu Tsai
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. Suppressed trion formation: CsPb1−xSnxBr3 quantum dots (QDs) were synthesized by a hot-injection approach. As trion formation is suppressed by the SnIV substitution, light-emitting diodes (LEDs) based on these highly luminescent QDs performed very well, with the highest current efficiencies and external quantum efficiencies ever reported for such Sn-based systems.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201706860

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