Issue 17, 2016

Highly efficient emitters of ultra-deep-blue light made from chrysene chromophores

Abstract

Chrysene, which has a wide band gap, was selected as an emission core to develop and study new materials that emit ultra-deep-blue light with high efficiency. Six compounds introducing various side groups were designed and synthesized: 6,12-bis(3′,5′-diphenylphenyl)chrysene (TP-C-TP), 6-(3′,5′-diphenylphenyl)-12-(3\,5\-diphenylbiphenyl-4′′-yl)chrysene (TP-C-TPB) and 6,12-bis(3′′,5′′-diphenylbiphenyl-4′-yl)chrysene (TPB-C-TPB), which contained bulky aromatic side groups; and N,N,N′,N′-tetraphenyl-chrysene-6,12-diamine (DPA-C-DPA), [12-(4-diphenylamino-phenyl)-chrysen-6-yl]-diphenylamine (DPA-C-TPA) and 6,12-bis[4-(diphenylamino)phenyl]chrysene (TPA-C-TPA), which contained aromatic amine groups, were designed to afford improved hole injection properties. The synthesized materials showed maximum absorption wavelengths at 342–402 nm in the film state and exhibited deep-blue photoluminescence (PL) emissions at 417–464 nm. The use of TP-C-TPB in a non-doped organic light-emitting diode (OLED) device resulted in ultra-deep-blue emission with an external quantum efficiency (EQE) of 4.02% and Commission Internationale de L'Eclairage coordinates (CIE x, y) of (0.154, 0.042) through effective control of the internal conjugation length and suppression of the π–π* stacking. The use of TPA-C-TPA, which includes an aromatic amine side group, afforded an excellent EQE of 4.83% and excellent color coordinates CIE x, y of (0.147, 0.077).

Graphical abstract: Highly efficient emitters of ultra-deep-blue light made from chrysene chromophores

Supplementary files

Article information

Article type
Paper
Submitted
11 Nov. 2015
Accepted
12 Janv. 2016
First published
15 Janv. 2016

J. Mater. Chem. C, 2016,4, 3833-3842

Author version available

Highly efficient emitters of ultra-deep-blue light made from chrysene chromophores

H. Shin, H. Jung, B. Kim, J. Lee, J. Moon, J. Kim and J. Park, J. Mater. Chem. C, 2016, 4, 3833 DOI: 10.1039/C5TC03749B

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