Efficient Perovskite White Light-Emitting Diode Based on an Interfacial Charge-Confinement Structure

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

2 Scopus Citations
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Detail(s)

Original languageEnglish
Pages (from-to)44991-45000
Journal / PublicationACS Applied Materials and Interfaces
Volume13
Issue number37
Online published7 Sep 2021
Publication statusPublished - 22 Sep 2021

Abstract

Perovskite light-emitting diodes (LEDs) show great potential for next-generation lighting and display technology. Despite intensive studies on single-color devices, there are few reports on perovskite-based white LEDs (Pe-WLEDs). Here, an efficient Pe-WLED based on a blue perovskite and an orange phosphorescent emitter is reported for the first time. It is found that using a simple perovskite/phosphor bilayer emitting structure, there is inefficient energy transfer from the blue perovskite to the orange phosphor, leading to low efficiency and a significant color shift with driving voltage. We address this issue by introducing a quantum-well-like charge-confinement structure for enhancing carrier trapping and thus exciton formation in the phosphorescent emitter. As a result, a high external quantum efficiency of 10.81% is obtained. More interestingly, by tuning the dopant concentration of the phosphorescent emitter using this simple device structure, we can controllably get Pe-WLEDs with very stable white light for display applications or tunable color from warm white to daylight for lighting applications.

Research Area(s)

  • charge-confinement structure, color tunable, energy transfer, perovskite, trapping effect, white light-emitting diode

Citation Format(s)

Efficient Perovskite White Light-Emitting Diode Based on an Interfacial Charge-Confinement Structure. / Guan, Zhiqiang; Li, Yang; Zhu, Zhaohua; Zeng, Zixin; Shen, Dong; Tan, Jihua; Tsang, Sai-Wing; Liu, Shihao; Lee, Chun-Sing.

In: ACS Applied Materials and Interfaces, Vol. 13, No. 37, 22.09.2021, p. 44991-45000.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review