适用于低色温发光二极管的共轭低聚物的双光子吸收行为。

Two-photon absorption behavior of conjugated oligomers suitable for low colour temperature LEDs.

作者信息

Huang Tianhao, Jiang Chengzi, Xu Tianning, Ying Jinhui, Lu Ran, Zhou Huipeng

机构信息

Department of Science, Zhijiang College of Zhejiang University of Technology Shaoxing 312030 China

Griffith Business School, Griffith University Parklands Dr Southport QLD 4215 Australia.

出版信息

RSC Adv. 2023 Feb 10;13(8):5317-5323. doi: 10.1039/d3ra00083d. eCollection 2023 Feb 6.

DOI:10.1039/d3ra00083d

PMID:36777938

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9912286/

Abstract

Light emitting diodes (LEDs) with low colour temperatures (CTs) have been proved to be physiologically-friendly light sources. However, there are few reports on the photophysical properties of luminescent materials with CTs lower than candlelight. Herein, one- and two-photon optical properties of four fluorenone-based conjugated oligomers have been systemically investigated. By using a sum-over-essential states (SOS) approach, we obtained the transition dipole moments and two-photon absorption (TPA) cross sections. The triphenylamine end-capped oligomer exhibits reddish orange luminescence with extremely low colour temperature of 1686 K, which is much lower than that of candlelight. Fluorene-ethylene units serving as π-spacers could weaken the role of electron-donating units and effectively enhance the TPA performance of oligomers. Our results provide an effective way for the design and optimization of universal light-emitting material candidates in optoelectronic devices.

摘要

低色温（CT）的发光二极管（LED）已被证明是对生理有益的光源。然而，关于色温低于烛光的发光材料的光物理性质的报道很少。在此，系统研究了四种芴酮基共轭低聚物的单光子和双光子光学性质。通过使用基本态求和（SOS）方法，我们获得了跃迁偶极矩和双光子吸收（TPA）截面。三苯胺封端的低聚物呈现出红橙色发光，色温极低，为1686K，远低于烛光的色温。作为π间隔基的芴-乙烯单元可以削弱供电子单元的作用，并有效提高低聚物的TPA性能。我们的结果为光电器件中通用发光材料候选物的设计和优化提供了一种有效方法。