Using a mixed emitting layer of hole and electron transporting molecules to improve the performance of MOLED

Fengying Ma; Chunyu Zhang; Yun Liu; Yongqiang Ning; Xingyuan Liu; Li Qin; Changqin Jin; Lijun Wang

doi:10.1117/12.521636

12 May 2004 Using a mixed emitting layer of hole and electron transporting molecules to improve the performance of MOLED

Fengying Ma, Chunyu Zhang, Yun Liu, Yongqiang Ning, Xingyuan Liu, Li Qin, Changqin Jin, Lijun Wang

Author Affiliations +

Proceedings Volume 5280, Materials, Active Devices, and Optical Amplifiers; (2004) https://doi.org/10.1117/12.521636
Event: Asia-Pacific Optical and Wireless Communications, 2003, Wuhan, China

Abstract

Performance of the devices is significantly influenced by the charge balance between holes and electrons since the excess of one type over the other would lead to an increase in current but no emission contribution. The device performances were dramatically enhanced by using a mixed emitting layer of NPB and Alq₃ molecules, placed between pure NPB and Alq₃ layer. Comparing with the conventional heterostructure the turn-on voltage was reduced from 7v to 4v and the V--L characteristics was also improved by mixing hole and electron transporting layers. By changing the weight ratio of NPB and Alq₃ the spectrum have 33nm shift and the CIE coordinates have relevant change.

Citation Download Citation

Fengying Ma, Chunyu Zhang, Yun Liu, Yongqiang Ning, Xingyuan Liu, Li Qin, Changqin Jin, and Lijun Wang "Using a mixed emitting layer of hole and electron transporting molecules to improve the performance of MOLED", Proc. SPIE 5280, Materials, Active Devices, and Optical Amplifiers, (12 May 2004); https://doi.org/10.1117/12.521636

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