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

Jin Young Park; G. Seeta Rama Raju; Byung Kee Moon; Jung Hyun Jeong

doi:10.1039/c5ra13284c

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

Jin Young Park, G. Seeta Rama Raju, Byung Kee Moon, Jung Hyun Jeong

Department of Energy and Materials Engineering

Pukyong National University

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

Sub-micron sized ZrO₂ spheres were synthesized by a facile solvothermal reaction method. The influence of Zr(OPr)₄ concentration on the size and size distribution of ZrO₂ spheres were examined by taking the scanning electron microscope and transmission electron microscope images. When the concentration of Zr(OPr)₄ was increased from 0.031 to 0.045 mol, the average size of the spheres also increased from 305 to 920 nm. The diffused reflectance spectra of the calcined ZrO₂ spheres exhibited the higher reflectivity than that of as-prepared ZrO₂ spheres. As compared to the bare LEDs, light extraction efficiency was improved to 23% when the ZrO₂ spheres were coated on the ITO surface, however, 70.12% was improved when the ZrO₂ spheres were coated on the GaN surface due to the spherical morphology induced photon escape cone enhancement.

Original language	English
Pages (from-to)	81915-81919
Number of pages	5
Journal	RSC Advances
Volume	5
Issue number	100
DOIs	https://doi.org/10.1039/c5ra13284c
State	Published - 21 Sep 2015

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title = "Facile solvothermal synthesis of high refractive index ZrO2 spheres: Estimation of the enhanced light extraction efficiency",

abstract = "Sub-micron sized ZrO2 spheres were synthesized by a facile solvothermal reaction method. The influence of Zr(OPr)4 concentration on the size and size distribution of ZrO2 spheres were examined by taking the scanning electron microscope and transmission electron microscope images. When the concentration of Zr(OPr)4 was increased from 0.031 to 0.045 mol, the average size of the spheres also increased from 305 to 920 nm. The diffused reflectance spectra of the calcined ZrO2 spheres exhibited the higher reflectivity than that of as-prepared ZrO2 spheres. As compared to the bare LEDs, light extraction efficiency was improved to 23% when the ZrO2 spheres were coated on the ITO surface, however, 70.12% was improved when the ZrO2 spheres were coated on the GaN surface due to the spherical morphology induced photon escape cone enhancement.",

author = "Park, {Jin Young} and {Rama Raju}, {G. Seeta} and Moon, {Byung Kee} and Jeong, {Jung Hyun}",

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AU - Park, Jin Young

AU - Rama Raju, G. Seeta

AU - Moon, Byung Kee

AU - Jeong, Jung Hyun

PY - 2015/9/21

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AB - Sub-micron sized ZrO2 spheres were synthesized by a facile solvothermal reaction method. The influence of Zr(OPr)4 concentration on the size and size distribution of ZrO2 spheres were examined by taking the scanning electron microscope and transmission electron microscope images. When the concentration of Zr(OPr)4 was increased from 0.031 to 0.045 mol, the average size of the spheres also increased from 305 to 920 nm. The diffused reflectance spectra of the calcined ZrO2 spheres exhibited the higher reflectivity than that of as-prepared ZrO2 spheres. As compared to the bare LEDs, light extraction efficiency was improved to 23% when the ZrO2 spheres were coated on the ITO surface, however, 70.12% was improved when the ZrO2 spheres were coated on the GaN surface due to the spherical morphology induced photon escape cone enhancement.

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

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