Electroluminescent white light-emitting diodes with cadimum-free Cu-In-Zn-S nanocrystals sandwiched between two TFB layers

Peiwen Lv; Lijin Wang; Xu Li; Chunhe Yang; Zhe Yin; Zhe Yin; Aiwei Tang; Aiwei Tang

doi:10.1364/OL.458397

Optics Letters
Vol. 47,
Issue 11,
pp. 2722-2725
(2022)
•https://doi.org/10.1364/OL.458397

Electroluminescent white light-emitting diodes with cadimum-free Cu-In-Zn-S nanocrystals sandwiched between two TFB layers

Peiwen Lv, Lijin Wang, Xu Li, Chunhe Yang, Zhe Yin, and Aiwei Tang

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Peiwen Lv, Lijin Wang, Xu Li, Chunhe Yang, Zhe Yin, and Aiwei Tang, "Electroluminescent white light-emitting diodes with cadimum-free Cu-In-Zn-S nanocrystals sandwiched between two TFB layers," Opt. Lett. 47, 2722-2725 (2022)

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Abstract

A high color rendering index (CRI) and stable spectra under different voltages are important parameters for large-area planar light sources. However, the spectrum of most electroluminescent white light-emitting diodes (el-WLEDs) with a single emissive layer (EML) varies with a changing voltage. Herein, an el-WLED is fabricated based on Cd-free Cu-In-Zn-S (CIZS)/ZnS nanocrystals (NCs) and poly [(9,9-dioctylfluorenyl-2,7-diyl)-co-(4,4’-(N-(p-butylphenyl))diphenylamine)] (TFB) as double EMLs, which exhibit white-light emission with a high CRI value of 91 and commission internationale de l’éclairage (CIE) color coordinates of (0.33, 0.33). Meanwhile, it has a stable spectrum under voltage up to 7 V and a maximum luminance up to 679 cd/m² with a low turn-on voltage of 2.2 V. This work provides a foundation for Cd-free el-WLEDs with high CRI and stable spectra.

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Supplementary Material (1)

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Supplement 1	supplementary materials for publication

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