New blue phosphorescent heteroleptic Ir(III) complexes with imidazole- and N-methylimidazole carboxylates as ancillary ligands,Journal of Materials Chemistry C

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New blue phosphorescent heteroleptic Ir(III) complexes with imidazole- and N-methylimidazole carboxylates as ancillary ligands
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2020-09-23 , DOI: 10.1039/d0tc03773g
Hea Jung Park _{1,

2,

3,

4} , Eun Ah Chae _{1,

2,

3,

4} , Hye Won Seo _{1,

2,

3,

4} , Jae-Ho Jang _{1,

2,

3,

4} , Won Jae Chung _{4,

5,

6,

7} , Jun Yeob Lee _{4,

5,

6,

7} , Do-Hoon Hwang _{1,

2,

3,

4} , Ung Chan Yoon _{1,

2,

3,

4}

Affiliation

Imidazole- and N-methylimidazole carboxylate have been introduced to serve as ancillary ligands in heteroleptic Ir(III) complexes containing 2-phenylpyridine-based main ligands, with consideration of the frontier orbital energy levels. Complexes Ir1–Ir4 were synthesized and found to have LUMO levels higher than that of the corresponding Ir(III) complex containing pyridyl carboxylate. All the synthesized Ir(III) complexes exhibited blue phosphorescence emission maxima in the region of 465–467 nm at room temperature. Phosphorescent quantum efficiencies were increased by a factor of 1.8–6.7 by blocking the intermolecular hydrogen bonding between the imidazole carboxylate ligands of neighboring Ir(III) complexes, which was achieved by N-methylation of the imidazole carboxylate ancillary ligand. The organic light-emitting diodes fabricated using Ir3 and Ir4 as dopant materials in the emissive layers were found to emit blue emission with peaks at 469 and 471 nm and maximum external quantum efficiencies of 20.0 and 22.4%, respectively. Moreover, all the fabricated devices with Ir3 and Ir4 exhibited low efficiency roll-off, indicating excellent stability of the materials.

中文翻译：

新型蓝色磷光杂环Ir（III）配合物，含咪唑和N-甲基咪唑羧酸盐作为辅助配体

考虑到前沿轨道能级，已引入咪唑和N-甲基咪唑羧酸酯作为杂配的Ir（III）配合物的辅助配体，该配合物含有2-苯基吡啶基主配体。合成了配合物Ir1-Ir4，发现其LUMO含量高于相应的含吡啶基羧酸盐的Ir（III）配合物。在室温下，所有合成的Ir（III）配合物在465-467 nm范围内均显示出最大的蓝色磷光发射。通过阻止相邻的Ir（）的咪唑羧酸酯配体之间的分子间氢键，磷光的量子效率提高了1.8-6.7倍。III）配合物，其通过咪唑羧酸酯辅助配体的N-甲基化而获得。发现在发射层中使用Ir3和Ir4作为掺杂剂材料制造的有机发光二极管发出蓝光，其峰值分别在469和471 nm处，最大外部量子效率分别为20.0和22.4％。此外，所有用Ir3和Ir4制作的器件都显示出低效率的滚降，表明材料的稳定性极好。

更新日期：2020-10-16

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