Omnidirectional Reflector based on Transparent Oxide Materials for Light Extraction Enhancement of Organic and Inorganic Solid-state Light Emitting Devices
High performance reflector is significant structure for efficiency improvement of organic and inorganic solid-state light emitting devices because a large difference in the refractive index between the light source and air leads to multiple internal reflections at the reflector. Then we focused on w...
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| Veröffentlicht in: | Journal of Photopolymer Science and Technology 2018/06/25, Vol.31(3), pp.363-368 |
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| container_end_page | 368 |
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| container_issue | 3 |
| container_start_page | 363 |
| container_title | Journal of Photopolymer Science and Technology |
| container_volume | 31 |
| creator | Yamae, Kazuyuki Fukshima, Hiroshi Iwahashi, Tomoya Yasuda, Masaharu Fujimoto, Kozo |
| description | High performance reflector is significant structure for efficiency improvement of organic and inorganic solid-state light emitting devices because a large difference in the refractive index between the light source and air leads to multiple internal reflections at the reflector. Then we focused on wide angular light incidence and designed a total internal omnidirectional reflector (TI-ODR) based on transparent oxide layers. The simulation results showed that light extraction structure with TI-ODR gives 17% and 4% efficiency enhancement compared to typical Ag based mirror for organic LED (n=1.8) and inorganic LED (n=2.4), respectively. Then the TI-ODR on blue LED structure was fabricated and that showed enhancement effect of about 8%. The layers are composed of conductive layer for current distribution, low-index thick layer for total internal reflection (TIR) of wide angular light, and high-index layer for the reinforcement of adhesion of layers. |
| doi_str_mv | 10.2494/photopolymer.31.363 |
| format | Article |
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Then we focused on wide angular light incidence and designed a total internal omnidirectional reflector (TI-ODR) based on transparent oxide layers. The simulation results showed that light extraction structure with TI-ODR gives 17% and 4% efficiency enhancement compared to typical Ag based mirror for organic LED (n=1.8) and inorganic LED (n=2.4), respectively. Then the TI-ODR on blue LED structure was fabricated and that showed enhancement effect of about 8%. 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Photopol. Sci. Technol.</addtitle><date>2018-06-25</date><risdate>2018</risdate><volume>31</volume><issue>3</issue><spage>363</spage><epage>368</epage><pages>363-368</pages><issn>0914-9244</issn><eissn>1349-6336</eissn><abstract>High performance reflector is significant structure for efficiency improvement of organic and inorganic solid-state light emitting devices because a large difference in the refractive index between the light source and air leads to multiple internal reflections at the reflector. Then we focused on wide angular light incidence and designed a total internal omnidirectional reflector (TI-ODR) based on transparent oxide layers. The simulation results showed that light extraction structure with TI-ODR gives 17% and 4% efficiency enhancement compared to typical Ag based mirror for organic LED (n=1.8) and inorganic LED (n=2.4), respectively. Then the TI-ODR on blue LED structure was fabricated and that showed enhancement effect of about 8%. 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| subjects | Current distribution Light emitting diodes Light extraction efficiency Omnidirectional Oxide material Refractivity Solid state Solid-state lighting |
| title | Omnidirectional Reflector based on Transparent Oxide Materials for Light Extraction Enhancement of Organic and Inorganic Solid-state Light Emitting Devices |
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