High-Brightness Blue and White LEDs based on Inorganic Perovskite Nanocrystals and their Composites

Yao, En -Ping; Yang, Zhanlue; Meng, Lei; Sun, Pengyu; Dong, Shiqi; Yang, Ye; Yang, Yang

doi:10.1002/adma.201606859

High-Brightness Blue and White LEDs based on Inorganic Perovskite Nanocrystals and their Composites

Journal Article · Mon Apr 10 04:00:00 EDT 2017 · Advanced Materials

DOI:https://doi.org/10.1002/adma.201606859· OSTI ID:1364159

Yao, En -Ping ^[1]; Yang, Zhanlue ^[2]; Meng, Lei ^[2]; Sun, Pengyu ^[2]; Dong, Shiqi ^[2]; Yang, Ye ^[3]; Yang, Yang ^[2]

Univ. of California, Los Angeles, CA (United States); National Cheng Kung Univ., Tainan (Taiwan)
Univ. of California, Los Angeles, CA (United States)
National Renewable Energy Lab. (NREL), Golden, CO (United States)

Inorganic metal halide perovskite nanocrystals (NCs) have been employed universally in light-emitting applications during the past two years. Here, blue-emission (≈ 470 nm) Cs-based perovskite NCs are derived by directly mixing synthesized bromide and chloride nanocrystals with a weight ratio of 2:1. High-brightness blue perovskite light-emitting diodes (PeLEDs) are obtained by controlling the grain size of the perovskite films. Moreover, a white PeLED is demonstrated for the first time by blending orange polymer materials with the blue perovskite nanocrystals as the active layer. Exciton transfer from the blue nanocrystals to the orange polymers via Forster or Dexter energy transfer is analyzed through time resolved photoluminescence. In conclusion, by tuning the ratio between the perovskite nanocrystals and polymers, pure white light is achieved with the a CIE coordinate at (0.33,0.34).

View Accepted Manuscript (DOE)

Research Organization:: National Renewable Energy Lab. (NREL), Golden, CO (United States)

Sponsoring Organization:: Air Force Office of Scientific Research; National Science Foundation (NSF); USDOE

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 1364159

Report Number(s):: NREL/JA--5900-68405

Journal Information:: Advanced Materials, Journal Name: Advanced Materials Journal Issue: 23 Vol. 29; ISSN 0935-9648

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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