High-performance red quantum dot light-emitting diodes via exciton harvesting based on all-organic charge transport layers

IF 3.3 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence Pub Date : 2024-12-18 DOI:10.1016/j.jlumin.2024.121036

Shiyi Xie , Boyu Jiang , Yu Yang , Haolin Li , Aisima Maimaitimin , Tong Zhang , Boyu Zhou , Mingming Zhou , Yanping Wang , Xiaoyun Mi , Xiuling Liu

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引用次数: 0

Abstract

The performance of quantum dot light-emitting diodes (QLEDs) is typically constrained by several factors, including carrier injection imbalance and Auger recombination. Apart from exciton collection, the all-organic charge transport layers (CTLs) structure has been proven as an effective strategy to address the aforementioned issues. Herein, we present a novel red QLED incorporating all-organic CTLs composed of a hole transport layer (HTL) consisting of the green small molecule, bis(2-phenylpyridinato-C2,N) (acetylacetonate)iridium(III) (Ir(ppy)₂(acac)), doped poly [(9,9 dioctylfluorenyl-2,7-diyl)-alt-(4,4’-(N-(4-butylphenyl)] (TFB) and poly (9-vinylcarbazole) (PVK). In this ingeniously designed architecture, electrons that leak into the HTL can recombine with holes, facilitating efficient energy harvesting by Ir(ppy)₂(acac). Subsequently, the harvested energy is transferred to the neighboring quantum dot (QD) layer via the Förster resonance energy transfer (FRET) mechanism, thus improving the device performance. The top-performing QLED with a doping concentration of 5 wt% achieves an unprecedented external quantum efficiency (EQE) of 16.2 %, current efficiency (CE) of 21.5 cd A⁻¹ and luminance of 96039 cd m⁻². Furthermore, the device exhibits good stability and minimal efficiency roll-off.

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来源期刊

Journal of Luminescence 物理-光学

CiteScore

6.70

自引率

13.90%

发文量

850

审稿时长

3.8 months

期刊介绍： The purpose of the Journal of Luminescence is to provide a means of communication between scientists in different disciplines who share a common interest in the electronic excited states of molecular, ionic and covalent systems, whether crystalline, amorphous, or liquid. We invite original papers and reviews on such subjects as: exciton and polariton dynamics, dynamics of localized excited states, energy and charge transport in ordered and disordered systems, radiative and non-radiative recombination, relaxation processes, vibronic interactions in electronic excited states, photochemistry in condensed systems, excited state resonance, double resonance, spin dynamics, selective excitation spectroscopy, hole burning, coherent processes in excited states, (e.g. coherent optical transients, photon echoes, transient gratings), multiphoton processes, optical bistability, photochromism, and new techniques for the study of excited states. This list is not intended to be exhaustive. Papers in the traditional areas of optical spectroscopy (absorption, MCD, luminescence, Raman scattering) are welcome. Papers on applications (phosphors, scintillators, electro- and cathodo-luminescence, radiography, bioimaging, solar energy, energy conversion, etc.) are also welcome if they present results of scientific, rather than only technological interest. However, papers containing purely theoretical results, not related to phenomena in the excited states, as well as papers using luminescence spectroscopy to perform routine analytical chemistry or biochemistry procedures, are outside the scope of the journal. Some exceptions will be possible at the discretion of the editors.