High-Efficiency Phosphorescent Hybrid Organic-Inorganic Light-Emitting Diodes Using a Solution-Processed Small-Molecule Emissive Layer

ACS Applied Materials & Interfaces
Changjun FanXiaohui Yang

Abstract

The morphology and optical and electrical properties of solution-processed and vacuum-deposited 4,4',4″-tris(carbazol-9-yl)triphenylamine (TCTA):2,2'-(1,3-phenylene)bis[5-(4-tert-butylphenyl)-1,3,4-oxadiazole] (OXD-7) composite films are investigated. All of the films exhibit smooth and pinhole-free morphology, while the evaporated films possess enhanced carrier-transport properties compared to solution-processed ones. The close correlation between the carrier-transport feature and the packing density of the film is established. High-efficiency monochromatic and white phosphorescent hybrid organic-inorganic light-emitting diodes with solution-processed small-molecule emissive layers are reported: the maximum external quantum efficiencies of blue, yellow, and red devices are 18.9, 14.6, and 10.2%, respectively; white devices show a maximum luminance efficiency of 40 cd A(-1) and a power efficiency of 20.8 lm W(-1) at 1000 cd m(-2). The efficiencies of blue, red, and white devices represent significant improvement over previously reported values.

References

Jun 22, 2010·Advanced Materials·Henk J BolinkMichele Sessolo
Jun 22, 2010·Advanced Materials·Dinesh KabraRichard H Friend
Feb 24, 2011·Advanced Materials·Michele Sessolo, Henk J Bolink
May 7, 2015·Advanced Materials·Bo Ram LeeMyoung Hoon Song

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