A spiro[fluorene-9,9ʹ-xanthene] based sky-blue emitter with hybridized local and charge-transfer (HLCT) characteristic for solution-processed OLEDs

IF 3.3 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence Pub Date : 2025-04-28 DOI:10.1016/j.jlumin.2025.121279

En-Shuo Zhou , Qiyin Chen , Xiao Long , Chen-Sheng Li , Zhi-Wei Mao , Bao-Yi Ren , Gang Xiong , Ya-Guang Sun , Guohua Xie

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Abstract

Limited by the spin statistics, the conventional organic fluorescent emitters have only the maximum exciton utilization efficiency of 25 % in electroluminescent devices. Endowing the molecular excited-state a hybridized local and charge-transfer (HLCT) characteristic is a promising pathway to break through the limitation. Here, we reported a sky-blue emitter with a D‒A‒D architecture, 4,7-di(spiro[fluorene-9,9ʹ-xanthen]-3ʹ-yl)benzo[c] [1,2,5]thiadiazole (3ʹ-SFX-BT), in which the weak and bulky donors of spiro[fluorene-9,9ʹ-xanthene] were bridged by a strong acceptor benzo[c] [1,2,5]thiadiazole through a simple coupling reaction. 3ʹ-SFX-BT possessed an emission peak at 497 nm with a Ф_PL of 23.3 % in neat film. The solvatochromic experiment and theoretical calculation indicated that 3ʹ-SFX-BT existed HLCT excited-state characteristic. The solution processed electroluminescent device presented a maximum external quantum efficiency of 2.7 %, representing an exciton utilization efficiency above 55 %. The result thus sheds light on the rational design of SFX-based HLCT emitters for more efficient solution-processed organic light-emitting diodes.

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溶液处理oled中具有杂化局域和电荷转移（HLCT）特性的螺旋[芴-9,9′-杂蒽]天蓝发射器

受自旋统计量的限制，传统的有机荧光发射器在电致发光器件中激子利用率最高仅为25%。赋予分子激发态以局部和电荷转移（HLCT）的杂化特性是突破这一限制的一条有希望的途径。本文报道了一种具有D-A-D结构的天蓝色发射体，4,7-二（螺[芴-9,9′-黄原烯]-3′-酰基）苯并[c][1,2,5]噻二唑（3′-SFX-BT），其中螺[芴-9,9′-黄原烯]的弱而笨重的给体通过简单的偶联反应被强受体苯并[c][1,2,5]噻二唑桥接。3′-SFX-BT在497nm处有一个发光峰，在纯膜中发光的ФPL为23.3%。溶剂致变色实验和理论计算表明，3′-SFX-BT具有HLCT激发态特性。溶液处理的电致发光器件的最大外量子效率为2.7%，激子利用效率在55%以上。因此，该结果为更有效的溶液处理有机发光二极管的基于sfx的HLCT发射器的合理设计提供了启示。

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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.