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Design and Optical Properties of ZnS: Mn Thin-Film Electroluminescent Devices on 2D SiO2 Corrugated Photonic Crystal Substrates
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- Authors
- Young Rag Do, Ki Young Ko, Yoon Chang Kim, Sang Hwan Cho, Young Duk Huh, Sun Jin Yun, Hea Young Choi
- Issue Date
- 2006-04
- Citation
- Journal of the Electrochemical Society, v.153, no.4, pp.H71-H77
- ISSN
- 0013-4651
- Publisher
- Electrochemical Society (ECS)
- Language
- English
- Type
- Journal Article
- Project Code
- 05MB3300, Flexible Display, Kang Kwang-Yong
- Abstract
- We studied the characteristics of ZnS:Mn thin-film electroluminescence (TFEL) display devices in which the glass substrate had been modified with a two-dimensional (2D) Si O2 corrugated photonic crystal (PC) pattern. The finite-difference time-domain (FDTD) method was used to predict the behavior of 2D corrugated PC ZnS:Mn TFEL devices with varying PC structural parameters. Based on the optimal parameters derived from the FDTD calculations, a 2D Si O2 corrugated PC layer was introduced onto the glass substrate of a typical ZnS:Mn TFEL structure by two-step irradiated hologram lithography and reactive ion etching. Experiments conducted under typical operating conditions showed that incorporation of the 2D corrugated structure improved the light extraction luminance at 40 V above the threshold voltage by over 3.1-fold compared to the conventional ZnS:Mn TFEL device, without noticeable degradation of the electrical characteristics. This improvement originates from the liberation of the photons trapped in the high-index guiding layers. © 2006 The Electrochemical Society. All rights reserved.
- KSP Keywords
- Corrugated structure, Display device, FDTD calculations, Finite-difference time-domain (fdtd) method, Glass substrate, High index, Optimal parameters, Reactive ion etching(RIE), Structure improved, TFEL device, Two-Step