Efficient management of excitons in near-infrared organic light-emitting diodes employing interlayer sensitization strategy

IF 3.3 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence Pub Date : 2025-04-07 DOI:10.1016/j.jlumin.2025.121238

Jie Hua , Zhuolin Zhan , Wenbo Song , Kuiyuan Gao , Chunyu Wei , Haipeng Jiang , Jianan Dai , Yuan Chai , He Dong , Jin Wang

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引用次数: 0

Abstract

Near-infrared (NIR) organic light-emitting diodes (OLEDs) have garnered significant attention owing to their promising applications in military, medical, and agricultural fields. However, the intrinsic characteristics of narrow energy gap and planar molecular structure of NIR organic materials result in low electroluminescence (EL) efficiency in OLEDs. Achieving both high efficiency and long-wavelength emission in NIR OLEDs remains a significant challenge. In this study, an interlayer sensitization strategy was employed to manage excitons and achieve highly efficient NIR-OLEDs with an emission peak wavelength exceeding 700 nm. Significantly, DMAC-DPS:TTPA was utilized as the sensitizing layer (SEL), while PPF:APDC-DTPA served as the emitting layer (EML). The separation of the EML and the SEL could effectively suppress direct carrier recombination in APDC-DTPA molecules, ensuring that the NIR emission primarily originates from exciton energy transfer from the sensitizer. Additionally, a spacer layer was incorporated to modulate exciton concentration within the NIR emitter and mitigate exciton quenching. By optimizing the doping concentration of TTPA sensitizer, highly efficient NIR OLEDs were achieved. The maximum external quantum efficiency (EQE) reached 6.61 %, with a NIR emission peak at 720 nm. These results provide a promising route to develop high efficiency NIR OLEDs for practical applications.

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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.