Song, Yi-Hwa published the artcileBright and efficient, non-doped, phosphorescent organic red-light-emitting diodes, Application of 2-[5-(Trifluoromethyl)-1H-1,2,4-triazol-3-yl]pyridine, the publication is Advanced Functional Materials (2004), 14(12), 1221-1226, database is CAplus.
Ir(III) metal complexes [(nazo)2Ir(Fppz)] (1), [(nazo)2Ir(Bppz)] (2), and [(nazo)2Ir(Fptz)] (3) [(nazo)H = 4-Ph quinazoline, (Fppz)H = 3-trifluoromethyl-5-(2-pyridyl) pyrazole, (Bppz)H = 3-t-butyl-5-(2-pyridyl) pyrazole, and (Fptz)H = 3-trifluoromethyl-5-(2-pyridyl) triazole] were synthesized, among which the exact configuration of 1 was confirmed using single-crystal x-ray diffraction anal. These complexes exhibited bright red phosphorescence with relatively short lifetimes of 0.4-1.05 μs in both solution and the solid-state at room temperature Nondoped organic light-emitting diodes (OLEDs) were fabricated using complexes 1 and 2 in the absence of a host matrix. Saturated red electroluminescence was observed at λmax = 626 nm (host-emitter complex 1) and 652 nm (host-emitter complex 2), which corresponds to coordinates (0.66,0.34) and (0.69,0.31), resp., on the 1931 Commission Internationale de l’Eclairage (CIE) chromaticity diagram. The nondoped devices employing complex 1 showed electroluminance ≤5780 cd m-2, an external quantum efficiency of 5.5% at 8 V, and a c.d. of 20 mA cm-2. The short phosphorescence lifetime of 1 in the solid state, coupled with its modest π-π stacking interactions, appear to be the determining factors for its unusual success as a nondoped host-emitter.
Advanced Functional Materials published new progress about 219508-27-7. 219508-27-7 belongs to triazoles, auxiliary class Trifluoromethylated Building Blocks, name is 2-[5-(Trifluoromethyl)-1H-1,2,4-triazol-3-yl]pyridine, and the molecular formula is Al2H32O28S3, Application of 2-[5-(Trifluoromethyl)-1H-1,2,4-triazol-3-yl]pyridine.
Referemce:
https://en.wikipedia.org/wiki/1,2,3-Triazole,
Triazoles – an overview | ScienceDirect Topics