Efficient Perovskite White Light-Emitting Diode Based on an Interfacial Charge-Confinement Structure
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
Author(s)
Related Research Unit(s)
Detail(s)
Original language | English |
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Pages (from-to) | 44991-45000 |
Journal / Publication | ACS Applied Materials and Interfaces |
Volume | 13 |
Issue number | 37 |
Online published | 7 Sept 2021 |
Publication status | Published - 22 Sept 2021 |
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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 et al.
In: ACS Applied Materials and Interfaces, Vol. 13, No. 37, 22.09.2021, p. 44991-45000.
In: ACS Applied Materials and Interfaces, Vol. 13, No. 37, 22.09.2021, p. 44991-45000.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review