Highly Efficient p-i-n and Tandem Organic Light-Emitting Devices Using an Air-Stable and Low-Temperature-Evaporable Metal Azide as an n-Dopant
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- Title
- Highly Efficient p-i-n and Tandem Organic Light-Emitting Devices Using an Air-Stable and Low-Temperature-Evaporable Metal Azide as an n-Dopant
- Authors
- Yook, KS; Jeon, SO; Min, SY; Lee, JY; Yang, HJ; Noh, T; Kang, SK; Lee, TW
- Date Issued
- 2010-06-09
- Publisher
- WILEY-V C H VERLAG GMBH
- Abstract
- Cesium azide (CsN3) is employed as a novel n-dopant because of its air stability and low deposition temperature. CsN3 is easily co-deposited with the electron transporting materials in an organic molecular beam deposition chamber so that it works well as an n-dopant in the electron transport layer because its evaporation temperature is similar to that of common organic materials. The driving voltage of the p-i-n device with the CsN3-doped n-type layer and a MoO3-doped p-type layer is greatly reduced, and this device exhibits a very high power efficiency (57 lm W-1). Additionally, an n-doping mechanism study reveals that CsN3 was decomposed into Cs and N-2 during the evaporation. The charge injection mechanism was investigated using transient electroluminescence and capacitance voltage measurements. A very highly efficient tandem organic light-emitting diodes (OLED; 84 cd A(-1)) is also created using an n-p junction that is composed of the CsN3-doped n-type organic layer/MoO3 p-type inorganic layer as the interconnecting unit. This work demonstrates that an air-stable and low-temperature-evaporable inorganic n-dopant can very effectively enhance the device performance in p-i-n and tandem OLEDs, as well as simplify the material handling for the vacuum deposition process.
- Keywords
- ELECTROLUMINESCENT DEVICES; TRANSPORT LAYERS; HOLE INJECTION; DIODES
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/25419
- DOI
- 10.1002/ADFM.201000137
- ISSN
- 1616-301X
- Article Type
- Article
- Citation
- ADVANCED FUNCTIONAL MATERIALS, vol. 20, no. 11, page. 1797 - 1802, 2010-06-09
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