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P‐179: Efficiency Enhancement of PLED by Using TiO x Electron Transport Layer with Prism Sheet Attachment
Author(s) -
Ho YuHsuan,
Liang Hsun,
Lai HiaoHan,
Chuang ChiaWen,
Chu ChihWei,
Wei PeiKuen
Publication year - 2011
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1889/1.3621236
Subject(s) - materials science , substrate (aquarium) , prism , layer (electronics) , optics , energy conversion efficiency , refractive index , optoelectronics , titanium , composite material , metallurgy , physics , oceanography , geology
The internal and external efficiency were found can be simultaneously improved by insertion a high refractive index material, titanium oxide (TiO x ), to the emission layer and a prism sheet attached to the substrate. The TiOx layer resulted in a better electron‐hole balance and thus increased the internal efficiency. However, it also led a wider angular FWHM of emission profile with more photons trapped in the substrate. By using the prism sheet, those trapped light was efficiently coupled to the air. The extraction efficiency enhancement at normal direction was increased from 33.1% to 54.4% without any device electricity degeneration. The overall current efficiency was improved 86% when 20‐nm‐thick TiO x film was used.