Molecular Design of Blue Phosphorescent Host Materials for Phenylimidazole‐Type Blue Triplet Emitters to Extend Operational Lifetime,Advanced Optical Materials

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Molecular Design of Blue Phosphorescent Host Materials for Phenylimidazole‐Type Blue Triplet Emitters to Extend Operational Lifetime
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2018-03-27 , DOI: 10.1002/adom.201701263
Sung Yong Byeon ₁ , Si Hyun Han ₁ , Jun Yeob Lee ₁

Affiliation

Herein, a molecular design to improve the quantum efficiency and lifetime of blue phosphorescent devices by managing the lowest unoccupied molecular orbital is developed. This is accomplished by introducing a strong electron‐withdrawing cyano (CN) moiety into the chemical structure, which is made up of carbazolylcarbazole and dibenzothiophene. The CN moiety is selectively introduced into the dibenzothiophene unit or carbazolylcarbazole unit to investigate the effect of the CN position on the device performance of blue phosphorescent organic light‐emitting diodes (OLEDs). It is demonstrated that substituting CN into dibenzothiophene effectively facilitates electron injection and enhances the quantum efficiency of the blue OLEDs. A high external quantum efficiency of 26.8% is achieved in the blue phosphorescent devices using an imidazole ligand‐derived Ir emitter based on the molecular design to modify dibenzothiophene with the CN moiety. This also extends the lifetime of the blue phosphorescent device doped with the CN‐modified, imidazole ligand‐derived Ir emitter.

中文翻译：

用于苯基咪唑型蓝色三重态发射体的蓝色磷光主体材料的分子设计，以延长其使用寿命

本文中，开发了通过管理最低的未占据分子轨道来改善蓝色磷光器件的量子效率和寿命的分子设计。这是通过在化学结构中引入强吸电子氰基（CN）部分来实现的，该结构由咔唑基咔唑和二苯并噻吩组成。将CN部分选择性地引入二苯并噻吩单元或咔唑基咔唑单元中，以研究CN位置对蓝色磷光有机发光二极管（OLED）器件性能的影响。已经证明，将CN替换为二苯并噻吩有效地促进了电子注入并增强了蓝色OLED的量子效率。外部量子效率高达26。使用基于咪唑配体的Ir发射体的蓝色磷光器件，其分子设计基于CN部分修饰二苯并噻吩实现了8％的产率。这也延长了掺杂有CN修饰的咪唑配体衍生的Ir发射体的蓝色磷光器件的寿命。

更新日期：2018-03-27

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