| Abstract
| - Oligomeric Zn3ppo6, where ppo is 2-(2-hydroxyphenyl)-5-phenyl-1,3-oxazole, has beensynthesized as a new blue-emitting material for organic light-emitting diodes (OLEDs). Theelectroluminescence maximum wavelength is 450 nm and the Commission Internationalede l'Eclairage (CIE) coordinates are x = 0.15, y = 0.11 for blue chromaticity. The luminanceefficiency 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 monomericstructure at different sublimation temperatures.
- One monomeric and two trimeric polymorphs of (Znppo2)n have been characterized by X-ray crystallography, and are related by thermal transformation.These two polymorphs of the oligomeric (Znppo2)3 show blue emission, a highly sought property for OLEDs.
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