TY - JOUR
T1 - A Cocktail of Multiple Cations in Inorganic Halide Perovskite toward Efficient and Highly Stable Blue Light-Emitting Diodes
AU - Yuan, Fang
AU - Ran, Chenxin
AU - Zhang, Lin
AU - Dong, Hua
AU - Jiao, Bo
AU - Hou, Xun
AU - Li, Jingrui
AU - Wu, Zhaoxin
PY - 2020/4/10
Y1 - 2020/4/10
N2 - Blue-emitting materials and their light-emitting diodes (LEDs) are always challenging in lighting and display applications. Recently, perovskite LEDs (PeLEDs) with efficient and stable green/red emission have made great progress, where external quantum efficiency (EQE) over 20% has been reached. However, it is still a big challenge to realize stable blue PeLEDs with high efficiency mainly because of the poor film quality and unreasonable device structure. Herein, a cocktail strategy, that is, multication (Cs/Rb/FA/PEA/K)Pb(Cl/Br)3, is demonstrated to improve both the efficiency and stability of blue PeLEDs. Combined with the "insulator-perovskite-insulator" structure, PeLEDs based on a multication (Cs/Rb/FA/PEA/K)Pb(Cl/Br)3 perovskite film show maximum EQE of 2.01% and maximum luminance of 4015 cd/m2 at 484 nm. More importantly, the device exhibits robust durability, and its half-lifetime is over 300 min under continuous operation. The multication strategy could open up a new avenue for the design of new blue-emitting materials for high-performing PeLEDs.
AB - Blue-emitting materials and their light-emitting diodes (LEDs) are always challenging in lighting and display applications. Recently, perovskite LEDs (PeLEDs) with efficient and stable green/red emission have made great progress, where external quantum efficiency (EQE) over 20% has been reached. However, it is still a big challenge to realize stable blue PeLEDs with high efficiency mainly because of the poor film quality and unreasonable device structure. Herein, a cocktail strategy, that is, multication (Cs/Rb/FA/PEA/K)Pb(Cl/Br)3, is demonstrated to improve both the efficiency and stability of blue PeLEDs. Combined with the "insulator-perovskite-insulator" structure, PeLEDs based on a multication (Cs/Rb/FA/PEA/K)Pb(Cl/Br)3 perovskite film show maximum EQE of 2.01% and maximum luminance of 4015 cd/m2 at 484 nm. More importantly, the device exhibits robust durability, and its half-lifetime is over 300 min under continuous operation. The multication strategy could open up a new avenue for the design of new blue-emitting materials for high-performing PeLEDs.
UR - http://www.scopus.com/inward/record.url?scp=85083881124&partnerID=8YFLogxK
U2 - 10.1021/acsenergylett.9b02562
DO - 10.1021/acsenergylett.9b02562
M3 - Article
AN - SCOPUS:85083881124
SN - 2380-8195
VL - 5
SP - 1062
EP - 1069
JO - ACS Energy Letters
JF - ACS Energy Letters
IS - 4
ER -