期刊
NANOSCALE
卷 6, 期 18, 页码 10727-10733出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4nr01520g
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资金
- IT R&D program of Ministry of Trade, Industry and Energy (MOTIE)/Korea Evaluation Institute of Industrial Technology (KEIT), Rep. of Korea [KI002068, 10041062, 10044412]
- Basic R&D program of ETRI
- IT R&D program of Development of Key Technology for Interactive Smart OLED Lighting, ETRI Internal Research Fund from Ministry of Science, ICT and Future Planning (MSIP)
- Korea Evaluation Institute of Industrial Technology (KEIT) [KI002068] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
A random scattering layer (RSL) consisting of a random nano-structure (RNS) and a high refractive index planarization layer (HRI PL) is suggested and demonstrated as an efficient internal light-extracting layer for transparent organic light emitting diodes (TOLEDs). By introducing the RSL, a remarkable enhancement of 40% and 46% in external quantum efficiency (EQE) and luminous efficacy (LE) was achieved without causing deterioration in the transmittance. Additionally, with the use of the RSL, the viewing angle dependency of EL spectra was reduced to a marginal degree. The results were interpreted as the stronger influence of the scattering effect over the microcavity. The RSL can be applied widely in TOLEDs as an effective light-extracting layer for extracting the waveguide mode of confined light at the indium tin oxide (ITO)/OLED stack without introducing spectral changes in TOLEDs.
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