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Electroluminescent characteristics of organic light emitting devices by close-spaced sublimation

MI-YOUNG HA1, JAE-HOON JUNG1, MIN-JAE LEE1, DA-YOUNG PARK1, SEUNG-JUNG CHOI1, MORA VEERA MADHAVA RAO1, DAE-GYE MOON1,*

Affiliation

  1. Department of Materials Engineering, Soonchunhyang University, Shinchang, Asan, Chungnam, 336-745, Republic of Korea

Abstract

We have demonstrated organic light emitting diodes by using a close spaced sublimation method. Small molecular electrontransporting layers of BAlq and TAZ were investigated for improving device performance by using close-spaced sublimation method. It was found that device with an electron transporting layer of TAZ exhibits a better performance compare to BAlq. The white organic light emitting diodes with an ITO/PVK:Ir(piq)3:FIrpic/TAZ/Li/Al structure is chosen as a device with different doping concentration of FIrpic emission materials. The PVK, Ir(piq)3 and FIrpic organic materials as the host and guest emission materials were spin coated at various concentration of FIrpic ranging from 1wt% to 10 wt%. The maximum luminance and current efficiency were 1037 cd/m2 and 3.26 cd/A, for white organic light emitting diodes with 10 wt% of FIrpic. The white light, with a Commission Internationale d’Eclairage chromaticity coordinates of (0.38, 0.36), is obtained with an applied voltage of 16V, showing a good white emission color for the 10 wt% of FIrpic device.

Keywords

Organic light, Emitting diode, Close-spaced sublimation, Luminance.

Submitted at: Feb. 7, 2016
Accepted at: April 5, 2016

Citation

MI-YOUNG HA, JAE-HOON JUNG, MIN-JAE LEE, DA-YOUNG PARK, SEUNG-JUNG CHOI, MORA VEERA MADHAVA RAO, DAE-GYE MOON, Electroluminescent characteristics of organic light emitting devices by close-spaced sublimation, Journal of Optoelectronics and Advanced Materials Vol. 18, Iss. 3-4, pp. 281-287 (2016)