journal article·2020-04-10

A Cocktail of Multiple Cations in Inorganic Halide Perovskite toward Efficient and Highly Stable Blue Light-Emitting Diodes

Fang Yuan, Chenxin Ran, Lin Zhang, Hua Dong, Bo Jiao, Xun Hou, Jingrui Li, Zhaoxin Wu

ACS Energy Letters· Volume 5· Issue 4
Publisher page

Abstract

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.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Perovskite Materials and Applications · Organic Light-Emitting Diodes Research · Quantum Dots Synthesis And Properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Key Laboratory for Physical Electronics and Devices of the Ministry of Education & Shaanxi Key Lab of Information Photonic Technique, School of Electronic and Information Engineering, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, P.R. China

Department of Applied Physics, Aalto University, FI-00076 AALTO, Finland

Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, School of Electronic Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, P.R. China

Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, P.R. China

Funding

Ministry of Education of the People's Republic of China · China Postdoctoral Science Foundation · Education Department of Shaanxi Province · National Natural Science Foundation of China · International Cooperation by Shaanxi · Shaanxi Province

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