molecules possess appropriate HOMO and LUMO energy levels for effective charge injection. The crystal structure for PI is reported. OLED devices were fabricated based on the pyrene-imidazole-phenyl hybrids as emitters and as dopants with CBP as host. OLED devices with PI doped (5% wt.) with CBP exhibits excellent device performance with a current efficiency of 9.82 cd/A, the power efficiency of 8.32
设计,合成了一系列基于多发色,pyr-咪唑-苯基的杂化发光小分子(PA,PI,PnB,PtB,PoM和PnDM),在与咪唑基团的N1位相连的苯基的对位上具有不同的给体基团,其特征是用于蓝色有机发光二极管(OLED)。系统地研究了分子的光物理,热和电化学性质。所有分子在室温下均显示出延迟的荧光,寿命范围为7.1至8.5 µs。合成的片段分子(四苯基咪唑:IA,IoM和InDM)显示了约2.90eV的高三重态能量。测定的玻璃化转变温度为77℃至123℃,并且分解温度高于280℃。这些分子具有适当的HOMO和LUMO能级,可进行有效的电荷注入。报道了PI的晶体结构。OLED器件是基于the-咪唑-苯基杂化物作为发射极和作为掺杂剂(以CBP为主体)制造的。具有CBP的PI掺杂(5%重量)的OLED器件具有出色的器件性能,电流效率为9.82 cd / A,功率效率为8.32 lm / W,外部量子效率为4
Synthese, Struktur und photophysikalische Eigenschaften von polyarylierten Imidazolen und Oxazolen
23 tetraphenylimidazoles 1,2 and 11 triphenyloxazoles 4,5 with amino, nitro, methoxy, hydroxy, or halogeno substituents chiefly in the para position were prepared. The absorption and fluorescence emission properties were investigated in ethanolic solution. The effects of the substituents in 1,2 on the spectral shifts show that the arrangement of the phenyl rings in 1 position is not coplanar in relation to the heterocycle whereas the phenyl rings in 2 position are more coplanar. The spectral changes of compound 2a in solvents of various polarity (dielectric constants 2,02-47,24) are almost negligible. The Stokes shift is moderately increased. A remarkable increase in the fluorescence quantum yield is observed by chlorine substitution in phenyl ring 2.