Perovskite-Gallium Nitride Tandem Light-Emitting Diodes with Improved Luminance and Color Tunability
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
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Detail(s)
Original language | English |
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Article number | 2201844 |
Journal / Publication | Advanced Science |
Volume | 9 |
Issue number | 22 |
Online published | 21 May 2022 |
Publication status | Published - 5 Aug 2022 |
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DOI | DOI |
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Attachment(s) | Documents
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Link to Scopus | https://www.scopus.com/record/display.uri?eid=2-s2.0-85130285891&origin=recordpage |
Permanent Link | https://scholars.cityu.edu.hk/en/publications/publication(270515e8-5d06-498d-b968-d30070de7884).html |
Abstract
Tandem structures with different subpixels are promising for perovskite-based multicolor electroluminescence (EL) devices in ultra-high-resolution full-color displays; however, realizing excellent luminance- and color-independent tunability considering the low brightness and stability of blue perovskite light-emitting diodes (PeLEDs) remains a challenge. Herein, a bright and stable blue gallium nitride (GaN) LED is utilized for vertical integration with a green MAPbBr3 PeLED, successfully achieving a Pe-GaN tandem LED with independently tunable luminance and color. The electronic and photonic co-excitation (EPCE) effect is found to suppress the radiative recombination and current injection of PeLEDs, leading to degraded luminance and current efficiency under direct current modulation. Accordingly, the pulse-width modulation is introduced to the tandem device with a negligible EPCE effect, and the average hybrid current efficiency is significantly improved by 139.5%, finally achieving a record tunable luminance (average tuning range of 16631 cd m-2 at an arbitrary color from blue to green) for perovskite-based multi-color LEDs. The reported excellent independent tunability can be the starting point for perovskite-based multicolor EL devices, enabling the combination with matured semiconductor technologies to facilitate their commercialization in advanced display applications with ultra-high resolution.
Research Area(s)
- gallium nitride light-emitting diodes, luminance and color tunability, perovskite light-emitting diodes, tandem structure, NANOCRYSTALS
Citation Format(s)
Perovskite-Gallium Nitride Tandem Light-Emitting Diodes with Improved Luminance and Color Tunability. / Li, Zong-Tao; Zhang, Hong-Wei; Li, Jia-Sheng et al.
In: Advanced Science, Vol. 9, No. 22, 2201844, 05.08.2022.
In: Advanced Science, Vol. 9, No. 22, 2201844, 05.08.2022.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
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