Work

Linkage engineering in hosts for dramatic efficiency enhancement of blue phosphorescent organic light-emitting diodes

Year: 2015

Type: article

Abstract: Higher triplet energy and balanced charge mobility is two key factors for high-efficiency host materials of phosphorescent organic light-emitting diodes (PhOLED), which are integrated in a carbazole-diphenylene-fluorene hybrid FDPCz2 (9,9'-(4',4"-(9H-fluorene-9,9-diyl)bis(biphenyl-4',4-diyl))bis(9H-carbazole)) on the basis of indirect linkage strategy. Owing to rationally spatial allocation of conjugation blocking and extension for diphenylene linkages, FDPCz2 achieves both high triplet energy of 2.97 eV and favorable charge mobility by order of 6.3 × 10(-6) cm(2) V(-1) s(-1). Compared to conventional hosts and a short-conjugated analogue FPCz2 (9,9'-(4,4'-(9H-fluorene-9,9-diyl)bis(4,1-phenylene)) bis(9H-carbazole)), FDPCz2 dramatically elevated device efficiencies with peak values of 40.6 cd A(-1) and 20.2% for blue PhOLEDs.

Source: Optics Express

DOI: 10.1364/oe.23.012887

Authors: Chaochao Fan, Ying Wei, Dongxue Ding, Hui Xu

Institution: Heilongjiang University

Language: English

Topic: Organic Light-Emitting Diodes Research

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,270

Funders: National Natural Science Foundation of China, Fok Ying Tong Education Foundation