Understanding excitonic behavior and electroluminescence light emitting diode application of carbon dots

IF 9.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Chinese Chemical Letters Pub Date : 2024-09-07 DOI:10.1016/j.cclet.2024.110426

Yuan Liu , Boyang Wang , Yaxin Li , Weidong Li , Siyu Lu

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Abstract

Carbon dots (CDs), due to their low cost, high stability, and high luminous efficiency, have emerged as an excellent material for the emissive layer in next-generation electroluminescent light-emitting diodes (ELEDs). However, improving the efficiency of fluorescent CDs-based ELEDs remains challenging, primarily because it is difficult to utilize triplet excitons in the electroluminescence process. Therefore, enhancing the exciton utilization efficiency of CDs during electroluminescence is crucial. Based on this, we exploited the characteristic large exciton binding energy commonly found in CDs to develop exciton-emitting CDs. These CDs facilitate the radiative recombination of excitons during electroluminescence, thereby improving the electroluminescent efficiency. By rationally selecting precursors, we developed high quantum efficiency CDs and subsequently constructed CDs-based ELEDs. The blue-light device exhibited an external quantum efficiency of over 4 %. This study introduces a novel design concept for CDs, providing a new strategy for developing high-performance blue ELEDs based on CDs.

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了解碳点的激子行为和电致发光发光二极管的应用

碳点（CD）因其低成本、高稳定性和高发光效率，已成为下一代电致发光二极管（ELED）发光层的绝佳材料。然而，提高基于荧光光盘的电致发光二极管的效率仍然具有挑战性，这主要是因为在电致发光过程中很难利用三重激子。因此，提高 CD 在电致发光过程中的激子利用效率至关重要。在此基础上，我们利用光盘中常见的大激子结合能特性，开发出了激子发光光盘。这些光盘有助于激子在电致发光过程中进行辐射重组，从而提高电致发光效率。通过合理选择前驱体，我们开发出了高量子效率的光盘，并随后构建了基于光盘的电致发光器件。该蓝光器件的外部量子效率超过 4%。这项研究引入了一种新颖的光盘设计理念，为开发基于光盘的高性能蓝光发光二极管提供了一种新策略。

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来源期刊

Chinese Chemical Letters 化学-化学综合

CiteScore

14.10

自引率

15.40%

发文量

8969

审稿时长

1.6 months

期刊介绍： Chinese Chemical Letters (CCL) (ISSN 1001-8417) was founded in July 1990. The journal publishes preliminary accounts in the whole field of chemistry, including inorganic chemistry, organic chemistry, analytical chemistry, physical chemistry, polymer chemistry, applied chemistry, etc.Chinese Chemical Letters does not accept articles previously published or scheduled to be published. To verify originality, your article may be checked by the originality detection service CrossCheck.