摘要： A family of complexes of the type trans-(NHC)2Pt(C≡C-Ar)2 (NHC = N-heterocyclic carbene and Ar = substituted phenyl or 4-pyridyl) exhibits blue or blue-green phosphorescence. The photoluminescence is 10 – 50 fold more efficient when the materials are in dispersed in a solid poly(methyl methacrylate) glass compared to in THF solution. The phosphorescence quantum efficiencies in PMMA glass range from 0.20 – 0.65, varying with the structure of the aryl acetylide ligands. Organic light emitting diodes (OLEDs) were fabricated by thermal evaporation, using bis[2-(diphenylphosphino)phenyl] ether oxide (DPEPO) as the host and 15% of the trans-(NHC)2Pt(C≡C-Ar)2 complexes as the dopant/emitters. Most of the OLEDs display good performance, with EL spectra that closely match the PL in the PMMA glass. The best performing materials have peak EQE ranging from 9.6 – 14.1%, with deep blue spectral profiles (minimum CIE (0.16,0.13). Several of the complexes have deep HOMO levels and they display poor EL performance attributed to inefficient host to emitter hole transfer.