Improvement of Mixed Electron Transport Structure Red Phosphorescent Organic Light-Emitting Diodes

In this paper, we demonstrate development of red phosphorescent Organic Light-Emitting Diodes (OLEDs) as the doping concentrations are varied with lithium-quinolate (Liq) doped electron transport layer (ETL). The experimental device has both mixed electron transport layer and electron injection laye...

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Bibliographic Details
Published in:Molecular Crystals and Liquid Crystals 2011-01, Vol.538 (1), p.53-60
Main Authors: Kim, Hoe Min, Seo, Ji Hyun, Han, Wone Keun, Lee, Kum Hee, Kang, Hyun Ju, Yoon, Seung Soo, Kim, Young Kwan
Format: Article
Language:English
Subjects:
Aluminum
Crystals
Devices
Doping
Electric potential
Electron transfer
Electron transport
Electron transport layer
Luminescence
Organic light emitting diodes
phosphorescent
Semiconductor doping
Voltage
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Summary:In this paper, we demonstrate development of red phosphorescent Organic Light-Emitting Diodes (OLEDs) as the doping concentrations are varied with lithium-quinolate (Liq) doped electron transport layer (ETL). The experimental device has both mixed electron transport layer and electron injection layer. The device configuration was ITO/NPB (50 nm)/4,4′-N-N′-dicarbazole-biphenyl (CBP) doped with 8% bis(2-phenylquinoline)iridium(III) (acetylacetonate) [Ir(pq) 2 (acac)] (30 nm)/Bphen doped with X% Liq (30 nm)/Liq (2 nm)/Al (100 nm), where the doping concentration of Liq in ETL was varied as 5%∼65%. When the Liq was mixed in the ETL, the efficiency and operating voltage of the experimental devices were improved in comparison with the reference device due to greater electron transport efficiency and an improved hole-electron balance.
ISSN:1542-1406
1563-5287
1527-1943
DOI:10.1080/15421406.2011.563634