Realization of high efficiency pure red CsPbI3 quantum dot light emitting diodes by polarity screening

IF 3.3 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence Pub Date : 2025-02-27 DOI:10.1016/j.jlumin.2025.121161

Changsheng Liang , Zhiwei Yao , Wenyuan Zhou , Ming Deng , Jingcheng Xu , Ting Zhang , Mi Ouyang , Tao Sun , Guohua Jia , Chaoyu Xiang

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Abstract

Perovskite quantum dots (QDs) are considered ideal materials for the next generation of light-emitting diodes (LEDs) due to their high color purity and tunable emission. The surface characteristics of QDs, especially the small-sized pure red QDs, significantly impact their optoelectronic performance, with surface defects remaining a major obstacle to achieving high-performance LEDs. Among the QDs synthesized by thermal injection, there are some QDs with poor ligand coverage and low crystallinity, and it is difficult for traditional post-treatment methods to effectively passivate these QDs. Here, we propose a new post-processing strategy using a mixed solution of isopropanol and methyl acetate to dissolve NH₄I to selectively screen small-sized QDs. This post-processing strategy can remove the low crystallinity QDs with poor ligand coverage and effectively passivate the remaining QDs in a halogen-rich environment. As a result of screening out lower-quality QDs, the overall performance of the QDs has been optimized, with the PLQY increasing from 79 % to 95 % and the lifetime improving from 12.7 ns to 13.7 ns. The EQE of devices based on the optimized QDs is 27.15 %, higher than the 19.46 % of the control devices.

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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.