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Synthesis, Polymorphs, and Luminescent Properties of Oligomeric Zn3ppo6

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journal contribution
posted on 30.12.2003, 00:00 authored by T. S. Kim, T. Okubo, T. Mitani
Oligomeric Zn3ppo6, where ppo is 2-(2-hydroxyphenyl)-5-phenyl-1,3-oxazole, has been synthesized as a new blue-emitting material for organic light-emitting diodes (OLEDs). The electroluminescence maximum wavelength is 450 nm and the Commission Internationale de l'Eclairage (CIE) coordinates are x = 0.15, y = 0.11 for blue chromaticity. The luminance efficiency and the maximum luminance were about 1.3 lm/W at 6 V, 5.8 mA/cm2 (139 cd/m2), and 8140 cd/m2 at 11.4 V. Zn3ppo6 shows two trimeric polymorphs and a monomeric structure at different sublimation temperatures.