TY - JOUR
T1 - Tin-Based Multiple Quantum Well Perovskites for Light-Emitting Diodes with Improved Stability
AU - Wang, Ying
AU - Zou, Renmeng
AU - Chang, Jin
AU - Fu, Zewu
AU - Cao, Yu
AU - Zhang, Liangdong
AU - Wei, Yingqiang
AU - Kong, Decheng
AU - Zou, Wei
AU - Wen, Kaichuan
AU - Fan, Ning
AU - Wang, Nana
AU - Huang, Wei
AU - Wang, Jianpu
N1 - Publisher Copyright:
Copyright © 2019 American Chemical Society.
PY - 2019/2/7
Y1 - 2019/2/7
N2 - Tin-based halide perovskites have attracted considerable attention for nontoxic perovskite light-emitting diodes (PeLEDs), but the easy oxidation of Sn 2+ and nonuniform film morphology cause poor device stability and reproducibility. Herein, we report a facile approach to achieve efficient and stable lead-free PeLEDs by using tin-based perovskite multiple quantum wells (MQWs) for the first time. On the basis of various spectroscopic investigations, we find that the MQW structure not only facilitates the formation of uniform and highly emissive perovskite films but also suppresses the oxidation of Sn 2+ cations. The tin-based MQW PeLED exhibits a peak external quantum efficiency of 3% and a high radiance of 40 W sr -1 m -2 with good reproducibility. Significantly, these devices show excellent operational stability with over a 2 h lifetime under a constant current density of 10 mA cm -2 , which is comparable to that of lead-based PeLEDs. These results suggest that perovskite MQWs can provide a promising platform for achieving high-performance lead-free PeLEDs.
AB - Tin-based halide perovskites have attracted considerable attention for nontoxic perovskite light-emitting diodes (PeLEDs), but the easy oxidation of Sn 2+ and nonuniform film morphology cause poor device stability and reproducibility. Herein, we report a facile approach to achieve efficient and stable lead-free PeLEDs by using tin-based perovskite multiple quantum wells (MQWs) for the first time. On the basis of various spectroscopic investigations, we find that the MQW structure not only facilitates the formation of uniform and highly emissive perovskite films but also suppresses the oxidation of Sn 2+ cations. The tin-based MQW PeLED exhibits a peak external quantum efficiency of 3% and a high radiance of 40 W sr -1 m -2 with good reproducibility. Significantly, these devices show excellent operational stability with over a 2 h lifetime under a constant current density of 10 mA cm -2 , which is comparable to that of lead-based PeLEDs. These results suggest that perovskite MQWs can provide a promising platform for achieving high-performance lead-free PeLEDs.
UR - http://www.scopus.com/inward/record.url?scp=85060376395&partnerID=8YFLogxK
U2 - 10.1021/acs.jpclett.8b03700
DO - 10.1021/acs.jpclett.8b03700
M3 - 文章
C2 - 30638010
AN - SCOPUS:85060376395
SN - 1948-7185
VL - 10
SP - 453
EP - 459
JO - Journal of Physical Chemistry Letters
JF - Journal of Physical Chemistry Letters
IS - 3
ER -