Facile solvothermal synthesis of high refractive index ZrO2 spheres: estimation of the enhanced light extraction efficiency

RSC Advances ◽  
2015 ◽  
Vol 5 (100) ◽  
pp. 81915-81919 ◽  
Author(s):  
Jin Young Park ◽  
G. Seeta Rama Raju ◽  
Byung Kee Moon ◽  
Jung Hyun Jeong
Keyword(s):  
Refractive Index ◽  
Solvothermal Synthesis ◽  
Extraction Efficiency ◽  
High Refractive Index ◽  
Light Extraction ◽  
Light Extraction Efficiency ◽  
Simulation Results

LightTools simulation results revealed that the light extraction efficiency of an LED has been improved to 70.12% when ZrO2 spheres were coated on the GaN surface.

scholarly journals Conical photonic crystals for enhancing light extraction efficiency from high refractive index materials

2015 ◽  
Vol 23 (17) ◽  
pp. 22730 ◽  
Author(s):  
Jeong-Gil Kim ◽  
Chih-Hung Hsieh ◽  
Hyungryul J. Choi ◽  
Jules Gardener ◽  
Bipin Singh ◽  
...  
Keyword(s):  
Refractive Index ◽  
Photonic Crystals ◽  
Extraction Efficiency ◽  
High Refractive Index ◽  
Light Extraction ◽  
Light Extraction Efficiency

High refractive index coating of phosphor-in-glass for enhanced light extraction efficiency of white LEDs

2017 ◽  
Vol 53 (2) ◽  
pp. 1335-1345 ◽  
Author(s):  
Xujia Xu ◽  
Hong Li ◽  
Yong Zhuo ◽  
Ruixin Li ◽  
Peijing Tian ◽  
...  
Keyword(s):  
Refractive Index ◽  
Extraction Efficiency ◽  
High Refractive Index ◽  
Light Extraction ◽  
Light Extraction Efficiency ◽  
White Leds

Effect of Glass Refractive Index on Light Extraction Efficiency of Light-Emitting Diodes

2014 ◽  
Vol 97 (9) ◽  
pp. 2789-2793 ◽  
Author(s):  
Jiyoung Seo ◽  
Sunil Kim ◽  
Yurian Kim ◽  
Fauzia lqbal ◽  
Hyungsun Kim
Keyword(s):  
Refractive Index ◽  
Light Emitting Diodes ◽  
Extraction Efficiency ◽  
Light Extraction ◽  
Light Extraction Efficiency ◽  
Light Emitting

scholarly journals Light Extraction from GaN-Microcavity

Nano Hybrids ◽  
2013 ◽  
Vol 3 ◽  
pp. 51-65
Author(s):  
Naser Mahmoud Ahmed ◽  
Z. Hassan
Keyword(s):  
Critical Angle ◽  
Extraction Efficiency ◽  
External Medium ◽  
Solid Angle ◽  
Light Extraction ◽  
Light Extraction Efficiency ◽  
Photoluminescence Emission ◽  
Transparent Substrate ◽  
Polarized Emission ◽  
Simulation Results

t will be demonstrated that light extraction of GaNcan be more efficient with the use of flat and dome epoxy. Theoretically the angle, wavelength, and thickness depend on the photoluminescence emission of the luminescent film of transparent substrate. This was studiedusing theFresnel type transmittance calculations for s- (TE) and p- (TM) polarized emission. Experimentally we have demonstrated a GaN/sapphire microcavity exhibited in the 1.3-1.6 fold enhancement in light extraction efficiency by using flat and dome epoxy as external medium compared with air external medium. In addition, simulation results shows that using (HfO2(), Epoxy (),MgF2 (), Air ()) improve the light extraction by increasingthe critical angle and diffracting the internal light with a large solid angle into the light escape cone.

Effect of refractive index of packaging materials on the light extraction efficiency of COB-LEDs with millilens array

2021 ◽  
Vol 60 (2) ◽  
pp. 306
Author(s):  
Xingjian Yu ◽  
Linyi Xiang ◽  
Shuling Zhou ◽  
Naiqi Pei ◽  
Xiaobing Luo
Keyword(s):  
Refractive Index ◽  
Extraction Efficiency ◽  
Light Extraction ◽  
Light Extraction Efficiency ◽  
Packaging Materials

scholarly journals Enhanced light extraction efficiency and viewing angle characteristics of microcavity OLEDs by using a diffusion layer

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Cheol Hwee Park ◽  
Shin Woo Kang ◽  
Sun-Gyu Jung ◽  
Dong Jun Lee ◽  
Young Wook Park ◽  
...  
Keyword(s):  
Diffusion Layer ◽  
Extraction Efficiency ◽  
Peak Shift ◽  
High Refractive Index ◽  
Light Extraction ◽  
Light Extraction Efficiency ◽  
Viewing Angle ◽  
Cavity Structure ◽  
Movement Distance ◽  
Micro Cavity

AbstractThe viewing angle characteristics and light extraction efficiency of organic light-emitting diodes (OLEDs) with a micro-cavity structure were enhanced. This was accomplished by inserting a diffusion layer composed of nano-sized structures of a transparent polymer poly(methyl methacrylate) (PMMA) combined with a zinc oxide (ZnO) semi-planarization layer with a high refractive index (n = 2.1) into the devices. The PMMA nanostructures were fabricated by employing a reactive ion etching (RIE) process. The height and density of the PMMA nanostructures were controlled by varying the speed at which the PMMA was spin-coated onto the substrate. The insertion of the diffusion layer into the micro-cavity OLEDs (MC-OLEDs) improved the external quantum efficiency (EQE) by as much as 17% when compared to that of a MC-OLED without a diffusion layer. Furthermore, adjustment of the viewing angle from 0° to 60° halved the peak shift distance of the electroluminescence (EL) spectra from 42 to 20 nm. Additionally, changing the viewing angle from 0° to 60° changed the color coordinate movement distance of the MC-OLED with the diffusion layer to 0.078, less than half of the distance of the MC-OLED without the diffusion layer (0.165).

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