High-efficiency and Low Roll-Off Red Phosphorescent Organic Light-emitting Diodes Enabled by Phenanthridine-based Bipolar Host Materials

IF 4.2 3区工程技术 Q2 CHEMISTRY, APPLIED Dyes and Pigments Pub Date : 2025-04-02 DOI:10.1016/j.dyepig.2025.112796

Hye Yeon Park , Jooho Lee , Chul Woong Joo , Hyunjun Jang , Ye ji Hyeon , Baeksang Sung , Hyunji Park , Jinhwa Kim , Soon-Ki Kwon , Jonghee Lee , Yun-Hi Kim

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Abstract

In this study, we report the synthesis of two host materials for high-efficiency and highly stable organic light-emitting diodes (OLEDs): 3-[4’-(triphenylsilyl)phenyl)-9H-carbazole]-6-phenylbenzofuro [3,2-k]phenanthridine (BF-PTD-SiCz) and 3-[4’-(triphenylsilyl)phenyl)-9H-carbazole]-6-phenylbenzo [4,5]thieno [3,2-k]phenanthridine (BT-PTD-SiCz). These phenanthridine-based bipolar host materials were synthesized via Ullman and Suzuki coupling reactions, reduction, nucleophilic acyl substitution, and reductive cyclization. Both materials exhibited excellent thermal stability. Red phosphorescent OLEDs (PhOLEDs) fabricated using BF-PTD-SiCz and BT-PTD-SiCz as hosts demonstrated improved roll-off characteristics compared to those of PhOLEDs that employed the conventional 4,4′-bis(N-carbazolyl)-1,1′-biphenyl (CBP) host. In particular, the BF-PTD-SiCz-based device exhibited an external quantum efficiency (EQE) of 13.86 %. These results indicate that BF-PTD-SiCz and BT-PTD-SiCz are well suited for use in high-efficiency red PhOLEDs.

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基于菲菲二极体材料的高效低滚降红光有机发光二极管

在这项研究中，我们报道了两种高效、高稳定性有机发光二极管（oled）的主体材料的合成：3-[4 ' -（三苯基硅基）苯基)- 9h -咔唑]-6-苯基苯并呋喃[3,2-k]菲咯啉（BF-PTD-SiCz）和3-[4 ' -（三苯基硅基）苯基)- 9h -咔唑]-6-苯基苯并[4,5]噻吩[3,2-k]菲咯啉（BT-PTD-SiCz）。通过Ullman和Suzuki偶联反应、还原反应、亲核酰基取代反应和还原环化反应合成了这些苯菲啶基双极性宿主材料。两种材料均表现出优异的热稳定性。与传统的4,4′-双（n -咔唑基）-1,1′-联苯（CBP）基质相比，使用BF-PTD-SiCz和BT-PTD-SiCz作为基质制备的红色磷光oled （PhOLEDs）具有更好的滚脱特性。特别是，基于bf - ptd - sicz的器件表现出13.86%的外量子效率（EQE）。这些结果表明，BF-PTD-SiCz和BT-PTD-SiCz非常适合用于高效红色发光二极管。

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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.