Three fluorophores based on imidazo[1,5-a]pyridine (ImPy) decorated with an aromatic π-system (C3 position of ImPy is decorated with naphthalene, methoxy-naphthalene and pyrene) were designed and synthesized by the one-pot synthesis method. The fluorophores were structurally characterized, and detailed computational study reveals that the compounds showed wide energy gap (>3 eV). The presently studied fluorophores exhibited good thermal and electrochemical stability. The systematic photophysical study discloses that the compounds showed sky-blue emission with CIE color coordinates (x = 0.16/0.20, y = 0.22/0.32). ImPy derivatives were used as an emitter to fabricate a sky-blue emission OLED. The novel synthesized material demonstrates a good performance for sky-blue emission OLED. Among the three emitters, the highest performance was observed with ImPy-3 demonstrating the maximum EQE 4.3%, power efficiency 4.7 lm W⁻¹, and current efficiency 8.4 cd A⁻¹ at 100 cd m⁻².

中文翻译：

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单极 1-苯基咪唑并[1,5-a]吡啶：一种用于溶液处理有机发光二极管的新型超亮天蓝色发光体

采用一锅法合成了三种基于芳香族π体系修饰的咪唑并[1,5 - a ]吡啶（ImPy）荧光团（ImPy的C3位被萘、甲氧基萘和芘修饰） . 荧光团在结构上进行了表征，详细的计算研究表明，这些化合物显示出较宽的能隙 (>3 eV)。目前研究的荧光团表现出良好的热稳定性和电化学稳定性。系统的光物理研究表明，这些化合物在 CIE 颜色坐标（x = 0.16/0.20, y= 0.22/0.32)。ImPy 衍生物被用作发射器来制造天蓝色发射 OLED。这种新型合成材料在天蓝色发光 OLED 方面表现出良好的性能。在三个发射器中，观察到最高性能的ImPy-3表现出最大的EQE 4.3%，功率效率为4.7 lm W ^-1，电流效率为8.4 cd A ^-1在100 cd m ^-2。