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This content will become publicly available on September 11, 2018

Title: Highly stable cesium lead iodide perovskite quantum dot light-emitting diodes

Recently, all-inorganic perovskites such as CsPbBr3 and CsPbI3, have emerged as promising materials for light-emitting applications. While encouraging performance has been demonstrated, the stability issue of the red-emitting CsPbI3 is still a major concern due to its small tolerance factor. Here we report a highly stable CsPbI3 quantum dot LED with red emission fabricated using an improved purification approach. The device achieved decent external quantum efficiency (EQE) of 0.21 % at a bias of 6 V and outstanding operational stability, with a L70 lifetime (EL intensity decreases to 70% of starting value) of 16 h and 1.5 h under a constant driving voltage of 5 V and 6 V (maximum EQE operation) respectively. Furthermore, the device can work under a higher voltage of 7 V (maximum luminance operation) and retain 50% of its initial EL intensity after 500 s. These findings demonstrate the promise of CsPbI3 quantum dots for stable red LEDs, and suggest the feasibility for electrically pumped perovskite lasers with further device optimizations.
Authors:
ORCiD logo [1] ;  [2] ;  [1] ;  [3] ;  [1]
  1. Univ. of Washington, Seattle, WA (United States). Electrical Engineering
  2. National Taiwan Univ., Taipei (Taiwan). Inst. of Electronics Engineering
  3. National Renewable Energy Lab. (NREL), Golden, CO (United States). Chemical and Biosciences Center
Publication Date:
Report Number(s):
NREL/JA-5900-68649
Journal ID: ISSN 0957-4484
Grant/Contract Number:
AC36-08GO28308; NNX13AL60H; MOST 105-2811-M-029-003
Type:
Accepted Manuscript
Journal Name:
Nanotechnology
Additional Journal Information:
Journal Volume: 28; Journal Issue: 45; Journal ID: ISSN 0957-4484
Publisher:
IOP Publishing
Research Org:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Aeronautic and Space Administration (NASA); Ministry of Science and Technology of Taiwan
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 36 MATERIALS SCIENCE; quantum dots; perovskites; LEDs
OSTI Identifier:
1395314