Construction of phenanthro[9,10-d]oxazole-based “hot exciton” AIEgens via molecular isomer engineering for efficient blue non-doped OLEDs

IF 4.1 3区工程技术 Q2 CHEMISTRY, APPLIED

Dyes and Pigments Pub Date : 2025-03-29 DOI:10.1016/j.dyepig.2025.112790

Hao-Sen Liao , Bao-Yue Wang , Dong Chen , Yi-Ming Cao , Ruo-Tong Zhao , Hai-jun Chi , Yan-Li Lv , Bo Zhao , Xiao Li

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引用次数: 0

Abstract

“Hot exciton” materials with aggregation-induced emission (AIE) properties have tremendous potential for application in high-performance blue non-doped organic light-emitting diodes (OLEDs). In this study, two novel blue fluorophores POT-1 and POT-2 were designed and synthesized by molecular isomer engineering. In two molecules, phenanthro [9,10-d]oxazole/triphenylamine acted as acceptor/donor, and triphenylethylene was used as the AIE-active moieties. Both fluorophores displayed excellent thermal properties and blue emissions with decent fluorescence efficiencies. Theoretical calculations proved that POT-1 and POT-2 possessed hybrid local and charge transfer (HLCT) properties with the “hot exciton” channels from T₃/T₄ to S₁. Additionally, POT-1 and POT-2 also exhibited AIE and mechanochromism effects, especially POT-1 showed a large redshift of 62 nm after grinding. The blue non-doped OLEDs based on the two emitters were prepared and the POT-2-based device demonstrated better performances of 9.48 cd A⁻¹, 8.27 lm W⁻¹ and 4.77 %. These results indicate the feasibility of molecular design via positional isomerization engineering to develop blue AIEgens with HLCT characteristics.

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来源期刊

Dyes and Pigments 工程技术-材料科学：纺织

CiteScore

8.20

自引率

13.30%

发文量

933

审稿时长

33 days

期刊介绍： Dyes and Pigments covers the scientific and technical aspects of the chemistry and physics of dyes, pigments and their intermediates. Emphasis is placed on the properties of the colouring matters themselves rather than on their applications or the system in which they may be applied. Thus the journal accepts research and review papers on the synthesis of dyes, pigments and intermediates, their physical or chemical properties, e.g. spectroscopic, surface, solution or solid state characteristics, the physical aspects of their preparation, e.g. precipitation, nucleation and growth, crystal formation, liquid crystalline characteristics, their photochemical, ecological or biological properties and the relationship between colour and chemical constitution. However, papers are considered which deal with the more fundamental aspects of colourant application and of the interactions of colourants with substrates or media. The journal will interest a wide variety of workers in a range of disciplines whose work involves dyes, pigments and their intermediates, and provides a platform for investigators with common interests but diverse fields of activity such as cosmetics, reprographics, dye and pigment synthesis, medical research, polymers, etc.