New blue emitters including phenanthro[9,10-d]oxazole and bulky side group

The new blue organic emitter materials, 4'-(3-(phenanthro[9,10-d]oxazol-2-yl -)phenyl)-5'-phenyl-1[1,1',:2',1''-tetraphenyl]-4-carbonitrile (m-PO-PPCN) and 4'-(4-(phenanthro[9,10-d]oxazol-2-yl-)phenyl)-5'-phenyl-1[1,1',:2',1''-tetraphenyl]-4- carbonitrile (p-PO-PPCN) have been successfully synthesized and characterized. In the film state, the ultraviolet-visible (UV-Vis) absorption peaks of m-PO-PPCN and p-PO-PPCN were 402 and 413 nm, and the photoluminescence (PL) peaks were 408 and 457 nm. The photoluminescence quantum yield (PLQY) of the two materials was 38.4% and 54.9%. Organic light emitting diodes using m-PO-PPCN and p-PO-PPCN as the emitting layer (EML) showed that m-PO-PPCN had a current efficiency of 0.97 cd/A and an EQE of 1.25%, p-PO-PPCN exhibited current efficiency of 3.69 cd/A and an EQE of 3.46%.

Automated summary

This article presents the synthesis and characterization of new blue organic emitter materials. These materials exhibit high absorption and emission peaks, as well as good photoluminescence quantum yield. Application in organic light emitting diodes shows that these materials have high current efficiency and quantum efficiency.