Light-extraction enhancement of white LEDs with different phases of TiO2:0.01Eu3+ spheres

Ju Young Mun; Ganji Seeta Rama Raju; Jin Young Park; Hyun Kyoung Yang

doi:10.1016/j.cap.2017.01.022

Light-extraction enhancement of white LEDs with different phases of TiO₂:0.01Eu³⁺ spheres

Ju Young Mun
, Ganji Seeta Rama Raju
, Jin Young Park
, Hyun Kyoung Yang

Department of Energy and Materials Engineering

Pukyong National University

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

13 Scopus citations

Abstract

We report the synthesis of TiO₂:0.01Eu³⁺ spheres by a solvothermal reaction method and their utilization in the enhancement of light-extraction efficiency. The light-extraction efficiency was enhanced by increasing the extraction probability of the internal and external reflected photons in the YAG:Ce³⁺ yellow phosphor based white light-emitting diodes (WLEDs). The crystalline structure of TiO₂:0.01Eu³⁺ spheres was investigated by an X-ray diffraction analysis. The anatase phased TiO₂:0.01Eu³⁺ spheres exhibited a typical red emission under 463.5 nm wavelength. The diffused reflectance spectra displayed higher reflectance for rutile phase and lower for anatase phase. However, compared to the typically, combination of YAG:Ce³⁺ yellow phosphor and blue LED chip, fabricated WLED, the light-extraction efficiency of WLED was improved to 80% when TiO₂: 0.01Eu³⁺ spheres were mixed with YAG:Ce³⁺ phosphor in the fabrication process.

Original language	English
Pages (from-to)	527-532
Number of pages	6
Journal	Current Applied Physics
Volume	17
Issue number	4
DOIs	https://doi.org/10.1016/j.cap.2017.01.022
State	Published - 1 Apr 2017

Keywords

Eu
Light extraction efficiency
Solvothermal
TiO
WLED

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10.1016/j.cap.2017.01.022

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@article{34dcb73453c24ebcbcd0c164fcbabc80,

title = "Light-extraction enhancement of white LEDs with different phases of TiO2:0.01Eu3+ spheres",

abstract = "We report the synthesis of TiO2:0.01Eu3+ spheres by a solvothermal reaction method and their utilization in the enhancement of light-extraction efficiency. The light-extraction efficiency was enhanced by increasing the extraction probability of the internal and external reflected photons in the YAG:Ce3+ yellow phosphor based white light-emitting diodes (WLEDs). The crystalline structure of TiO2:0.01Eu3+ spheres was investigated by an X-ray diffraction analysis. The anatase phased TiO2:0.01Eu3+ spheres exhibited a typical red emission under 463.5 nm wavelength. The diffused reflectance spectra displayed higher reflectance for rutile phase and lower for anatase phase. However, compared to the typically, combination of YAG:Ce3+ yellow phosphor and blue LED chip, fabricated WLED, the light-extraction efficiency of WLED was improved to 80\% when TiO2: 0.01Eu3+ spheres were mixed with YAG:Ce3+ phosphor in the fabrication process.",

keywords = "Eu, Light extraction efficiency, Solvothermal, TiO, WLED",

author = "Mun, \{Ju Young\} and Raju, \{Ganji Seeta Rama\} and Park, \{Jin Young\} and Yang, \{Hyun Kyoung\}",

note = "Publisher Copyright: {\textcopyright} 2017 Elsevier B.V.",

year = "2017",

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day = "1",

doi = "10.1016/j.cap.2017.01.022",

language = "English",

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journal = "Current Applied Physics",

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TY - JOUR

T1 - Light-extraction enhancement of white LEDs with different phases of TiO2:0.01Eu3+ spheres

AU - Mun, Ju Young

AU - Raju, Ganji Seeta Rama

AU - Park, Jin Young

AU - Yang, Hyun Kyoung

PY - 2017/4/1

Y1 - 2017/4/1

N2 - We report the synthesis of TiO2:0.01Eu3+ spheres by a solvothermal reaction method and their utilization in the enhancement of light-extraction efficiency. The light-extraction efficiency was enhanced by increasing the extraction probability of the internal and external reflected photons in the YAG:Ce3+ yellow phosphor based white light-emitting diodes (WLEDs). The crystalline structure of TiO2:0.01Eu3+ spheres was investigated by an X-ray diffraction analysis. The anatase phased TiO2:0.01Eu3+ spheres exhibited a typical red emission under 463.5 nm wavelength. The diffused reflectance spectra displayed higher reflectance for rutile phase and lower for anatase phase. However, compared to the typically, combination of YAG:Ce3+ yellow phosphor and blue LED chip, fabricated WLED, the light-extraction efficiency of WLED was improved to 80% when TiO2: 0.01Eu3+ spheres were mixed with YAG:Ce3+ phosphor in the fabrication process.

AB - We report the synthesis of TiO2:0.01Eu3+ spheres by a solvothermal reaction method and their utilization in the enhancement of light-extraction efficiency. The light-extraction efficiency was enhanced by increasing the extraction probability of the internal and external reflected photons in the YAG:Ce3+ yellow phosphor based white light-emitting diodes (WLEDs). The crystalline structure of TiO2:0.01Eu3+ spheres was investigated by an X-ray diffraction analysis. The anatase phased TiO2:0.01Eu3+ spheres exhibited a typical red emission under 463.5 nm wavelength. The diffused reflectance spectra displayed higher reflectance for rutile phase and lower for anatase phase. However, compared to the typically, combination of YAG:Ce3+ yellow phosphor and blue LED chip, fabricated WLED, the light-extraction efficiency of WLED was improved to 80% when TiO2: 0.01Eu3+ spheres were mixed with YAG:Ce3+ phosphor in the fabrication process.

KW - Eu

KW - Light extraction efficiency

KW - Solvothermal

KW - TiO

KW - WLED

UR - https://www.scopus.com/pages/publications/85012170382

U2 - 10.1016/j.cap.2017.01.022

DO - 10.1016/j.cap.2017.01.022

M3 - Article

AN - SCOPUS:85012170382

SN - 1567-1739

VL - 17

SP - 527

EP - 532

JO - Current Applied Physics

JF - Current Applied Physics

IS - 4

ER -

Light-extraction enhancement of white LEDs with different phases of TiO₂:0.01Eu³⁺ spheres

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Keywords

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