Issue 85, 2017

Efficient non-doped blue organic light-emitting diodes: donor–acceptor type host materials

Abstract

The new blue light emitting materials, (E)-4′-(1-(4-(2-(1-(naphthalen-1-yl)-1H-phenanthro[9,10-d]imidazol-2-yl)vinyl)phenyl)-1H-phenanthro[9,10-d]imidazol-2-yl)-N,N-diphenyl-[1,1′]-biphenyl-4-amine (NPI-PITPA), (E)-4′-(1-(4-(2-(1-(4-methylnaphthalen-1-yl)-1H-phenanthro[9,10-d]imidazol-2-yl)vinyl)phenyl)-1H-phenanthro[9,10-d]imidazol-2-yl)-N,N-diphenyl-[1,1′]-biphenyl-4-amine (MeNPI-PITPA) and (E)-4′-(1-(4-(2-(1-(4-methoxynaphthalen-1-yl)-1H-phenanthro[9,10-d]imidazol-2-yl)vinyl)phenyl)-1H-phenanthro[9,10-d]imidazol-2-yl)-N,N-diphenyl-[1,1′]-biphenyl-4-amine (OMeNPI-PITPA) with dual charge transport properties have been synthesized and characterised. These compounds exhibit excellent thermal properties with very high glass-transition temperature and thus are favourable to form thin films under thermal evaporation for non-doped organic light-emitting diodes (OLEDs). The non-doped blue device based on OMeNPI-PITPA show maximum efficiencies (ηex 4.90%; ηc 5.90 cd A−1; ηp 5.10 lm W−1) at low turn-on voltage and the device performances show that the phenanthroimidazole unit is a tunable building block for carrier injection properties and that they also can be used as hosts for green phosphorescent OLEDs.

Graphical abstract: Efficient non-doped blue organic light-emitting diodes: donor–acceptor type host materials

Supplementary files

Article information

Article type
Paper
Submitted
24 Oct 2017
Accepted
16 Nov 2017
First published
24 Nov 2017
This article is Open Access
Creative Commons BY license

RSC Adv., 2017,7, 54078-54086

Efficient non-doped blue organic light-emitting diodes: donor–acceptor type host materials

J. Jayabharathi, P. Sujatha, V. Thanikachalam, P. Jeeva and P. Nethaji, RSC Adv., 2017, 7, 54078 DOI: 10.1039/C7RA11732A

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