Improved Efficiency and Stability of Blue Phosphorescent Organic Light Emitting Diodes by Enhanced Orientation of Homoleptic Cyclometalated Ir(III) Complexes,Advanced Optical Materials

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Improved Efficiency and Stability of Blue Phosphorescent Organic Light Emitting Diodes by Enhanced Orientation of Homoleptic Cyclometalated Ir(III) Complexes
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2020-10-19 , DOI: 10.1002/adom.202001103
Jong Soo Kim ₁ , Daun Jeong ₂ , Hye Jin Bae ₁ , Yongsik Jung ₁ , Sungho Nam ₁ , Ji Whan Kim ₁ , Soo‐Ghang Ihn ₁ , Joonghyuk Kim ₁ , Won‐Joon Son ₂ , Hyeonho Choi ₁ , Sunghan Kim ₁

Affiliation

Novel homoleptic cyclometalated Ir(III) complexes are designed to improve their emission dipole orientations in the emitting layer of blue phosphorescent organic light emitting devices. Biphenyl group is introduced into the imidazole of cyclometalated Ir(III) complexes to simultaneously achieve enhanced efficiency and operation lifetime, resulting in one of the best device performances of single‐stacked organic light emitting diodes with 91% emission dipole orientation, 26.3% maximum external quantum efficiency (maximally calculated as 41%), and 169 h lifetime at 1000 cd m⁻² (LT80), color coordinate (0.17, 0.30). To elucidate the physical origin of this significant improvements, the orientational and positional distributions of the homoleptic dopants are analyzed with consideration on intermolecular interactions through atomistic modeling of the emitting layer. With the findings, the phosphorescent dopants could be designed in the future to achieve enhanced performance.

中文翻译：

通过提高均化环金属化Ir（III）配合物的取向来提高蓝色磷光有机发光二极管的效率和稳定性

新型均相环金属化的Ir（III）配合物旨在改善其在蓝色磷光有机发光器件的发射层中的发射偶极子取向。将联苯基引入到环金属化Ir（III）配合物的咪唑中，可同时实现更高的效率和使用寿命，从而使单堆叠有机发光二极管的最佳器件性能之一，其发射偶极子方向为91％，外部最大外部阻抗为26.3％量子效率（最大计算为41％），在1000 cd m ^-2时的寿命为169 h（LT80），色坐标（0.17，0.30）。为了阐明这种显着改善的物理原因，考虑了通过发光层的原子模型间的分子间相互作用，分析了均相掺杂剂的取向和位置分布。有了这些发现，将来可以设计磷光掺杂剂以实现增强的性能。

更新日期：2020-11-18

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