NDLI: Efficient Deep Blue Organic Light-Emitting Diodes Based on Wide Band Gap 4-Hydroxy-8-Methyl- 1.5-Naphthyridine Aluminum Chelate as Emitting and Electron Transporting Layer

Content Provider	IEEE Xplore Digital Library
Author	Chih-Chien Lee Chih-Hsien Yuan Shun-Wei Liu Yih-Shiun Shih
Copyright Year	2005
Abstract	We have developed a high efficiency and deep blue organic light-emitting diodes (OLEDs) incorporating a 4-hydroxy-8-methyl-1,5-naphthyridine aluminum chelate (AlmND₃) as the emitter and electron transporting layer (ETL). The blue AlmND₃ emitter, with an electron withdrawing group added to the well-known green fluorophore tris(8-hydroxyquinolinato)aluminum (Alq₃) , exhibited ambipolar charge transport as well as high electron and hole mobilities on the order of 10^-5 cm²/V·s, as deduced time-of-flight measurements. The magnitude of the electron mobility was 10 times greater than that of the widely used Alq₃ ETL, resulting in efficient charge balance in the AlmND₃ device. Based on a simple configuration of double heterojunction device, a blue device with the maximum external quantum efficiency of 1.58% and Commission Internationale de l'Eclairage (CIE) coordinates of (0.16, 0.08) was achieved at a brightness of 200 cd/m² . This study has revealed the fundamental nature of charge transport in hydroxynaphthyridine metal chelate and shed a new light on the design of high performance blue OLEDs.
Sponsorship	IEEE Lasers and Electro-Optics Society Optical Society of America
Starting Page	454
Ending Page	458
Page Count	5
File Size	510098
File Format	PDF
ISSN	1551319X
Volume Number	7
Issue Number	8
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-08-01
Publisher Place	U.S.A.
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Organic light emitting diodes Materials Electron mobility Heterojunctions Photoconductivity Transient analysis time-of-flight ${\hbox{AlmND}}_{3}$ ${\hbox{Alq}}_{3}$ deep blue organic light-emitting diodes (OLEDs) EML (emitter material layer) ETL (electron transporting layer)
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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