Enhancement of electroluminescent properties of organic light-emitting device by using exciton adjusting layer

Run Wang; Feng Xie; Guosheng Wang; Jin Guo

doi:10.1117/12.2504910

8 February 2019 Enhancement of electroluminescent properties of organic light-emitting device by using exciton adjusting layer

Run Wang, Feng Xie, Guosheng Wang, Jin Guo

Author Affiliations +

Proceedings Volume 10843, 9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Sensing and Imaging; 1084307 (2019) https://doi.org/10.1117/12.2504910
Event: Ninth International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT2018), 2018, Chengdu, China

Abstract

Organic light-emitting devices (OLEDs) with stable white light emitting were fabricated by using exciton adjusting layer (EAL) inserted between dual emitting layers (EMLs). Three charge transport materials with different characteristics were chosen as EAL, including 4,7-diphenyl-1,1′-phenanthroline (Bphen), N,N′-bis(3-methylphenyl)-N,N′-diphenylbenzidine (TPD) and N,N′-dicarbazolyl-3,5-benzene (mCP). Device structure was given as: ITO/NPB (30 nm)/mCP: (t-bt)2Ir(acac) (2 nm, 4 wt.%)/EALs/ mCP: Firpic (12 nm, 10 wt.%)/Bphen (35 nm)/Mg: Ag (100 nm). The results showed that, compared with device without EAL, the devices employed EAL yielded high device performance as well as favorable luminescence property and stable white emission. For the device with mCP EAL, the maximum brightness of 24700cd/m2 and current efficiency of 14.5 cd/A were obtained, while the CIE coordinates of device changed from (0.33, 0.35) to (0.35, 0.36) with the bias voltage increasing from 5 V to 12 V. It was suggested that by incorporating EAL in OLEDs, the charge carrier recombination zone was broadened, and the balance of electron-hole was improved between EMLs.

Citation Download Citation

Run Wang, Feng Xie, Guosheng Wang, and Jin Guo "Enhancement of electroluminescent properties of organic light-emitting device by using exciton adjusting layer", Proc. SPIE 10843, 9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Sensing and Imaging, 1084307 (8 February 2019); https://doi.org/10.1117/12.2504910

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