Layer Thickness-dependent Electrical and Optical Properties of Bottom- and Top-emission Organic Light-emitting DiodesLayer Thickness-dependent Electrical and Optical Properties of Bottom- and Top-emission Organic Light-emitting Diodes
- Other Titles
- Layer Thickness-dependent Electrical and Optical Properties of Bottom- and Top-emission Organic Light-emitting Diodes
- Authors
- 안희철; 나수환; 주현우; 김태완
- Issue Date
- 2009
- Publisher
- 한국전기전자재료학회
- Keywords
- Alq3; Organic light-emitting diodes; Microcavity; Top-emission
- Citation
- Transactions on Electrical and Electronic Materials, v.10, no.1, pp.28 - 30
- Journal Title
- Transactions on Electrical and Electronic Materials
- Volume
- 10
- Number
- 1
- Start Page
- 28
- End Page
- 30
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/22469
- ISSN
- 1229-7607
- Abstract
- We have studied organic layer-thickness dependent electrical and optical properties of bottom- and top-emission devices. Bottom-emission device was made in a structure of ITO(170 nm)/TPD(x nm)/Alq3(y nm)/LiF(0.5 nm)/Al(100 nm), and a top-emission device in a structure of glass/Al(100 nm)/TPD(x nm)/Alq3(y nm)/LiF(0.5 nm)/Al(25 nm). A hole-transport layer of TPD (N,N'-diphenyl-N,N'-di(m-tolyl)-benzidine) was thermally deposited in a range of 35 nm and 65 nm, and an emissive layer of Alq3 (tris-(8-hydroxyquinoline) aluminum) was successively deposited in a range of 50 nm and 100 nm. Thickness ratio between the hole-transport layer and the emissive layer was maintained to be 2:3, and a whole layer thickness was made to be in a range of 85 and 165 nm. From the current density-luminance-voltage characteristics of the bottom-emission devices, a proper thickness of the organic layer (55 nm thick TPD and 85 nm thick Alq3 layer) was able to be determined. From the view-angle dependent emission spectrum of the bottom-emission device, the peak wavelength of the spectrum does not shift as the view angle increases. However, for the top-emission device, there is a blue shift in peak wavelength as the view angle increases when the total layer thickness is thicker than 140 nm. This blue shift is thought to be due to a microcavity effect in organic light-emitting diodes.
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