Issue 16, 2023

Single-component electroluminescent white light-emitting diodes based on zinc oxide quantum dots with high color rendition and tunable correlated color temperature

Abstract

Single-component white light-emitting diodes (WLEDs) with high color rendition and adjustable correlated color temperature (CCT) are crucial to meet various lighting needs. Unfortunately, the development of efficient electroluminescent single-component WLEDs remains a challenge because of the issue of Kasha's rule. This work report the first demonstration of single-component electroluminescent WLEDs with widely adjustable CCT from 3303 to 8055 K and a very high color rendering index (>90) by using the zinc oxide quantum dots (ZnO-QDs), synthesized via a low temperature sol–gel method, as emissive layers. It is found that the electroluminescence intensity of different wavebands of the ZnO-QDs-based single-component WLEDs (ZnO-WLEDs) can be modulated effectively by the regulation of recombination centers and rates through hole transport layer (HTL) engineering. As a result, a series of warm to cold ZnO-WLEDs are realized with an ultralow turn-on voltage of 2.0 V, the maximum luminance up to 1214 cd m−2, and excellent color chromatic stability by the doping of poly(9,9-dioctylfluorene-co-N-(4-(3-methylpropyl)) diphenylamine) into HTLs, which are among the best performance of single-component ZnO-WLEDs. These results are very encouraging, and open up a new avenue for the development of low-cost, environment-friendly, and high-performance single-component WLEDs.

Graphical abstract: Single-component electroluminescent white light-emitting diodes based on zinc oxide quantum dots with high color rendition and tunable correlated color temperature

Supplementary files

Article information

Article type
Paper
Submitted
26 Dec 2022
Accepted
30 Mar 2023
First published
30 Mar 2023

J. Mater. Chem. C, 2023,11, 5402-5410

Single-component electroluminescent white light-emitting diodes based on zinc oxide quantum dots with high color rendition and tunable correlated color temperature

Y. Zhao, Y. Yang, L. Chen, H. Jiang, Y. Hu, Z. Lan, Y. Miao, Y. Wang, Y. Lei and F. Zhu, J. Mater. Chem. C, 2023, 11, 5402 DOI: 10.1039/D2TC05503A

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