Enhanced external luminescence quantum efficiency of ceramic phosphors by surface roughening

Avital Wagner; Barak Ratzker; Sergey Kalabukhov; Nachum Frage

doi:10.1016/j.jlumin.2019.05.058

Enhanced external luminescence quantum efficiency of ceramic phosphors by surface roughening

Avital Wagner, Barak Ratzker, Sergey Kalabukhov, Nachum Frage

Department of Materials Engineering

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

16 Scopus citations

Abstract

Ceramic phosphors show great promise for the realization of advanced high-power lighting devices. In the present work, ceramic Ce:YAG, which acts as a phosphor in white LEDs, was chosen as a case study to investigate the effect of surface roughness on the photoluminescence of ceramic phosphors. Highly transparent samples were fabricated by spark plasma sintering (SPS)and uniformly roughened with different grit size abrasive grinding paper. The average roughness (Ra)ranged from the nano-to the microscale (30–1570 nm). Photoluminescence (PL)emission intensity and external quantum efficiency (EQE)were found to significantly increase with surface roughness by 60 and 100%, respectively. Thus, we demonstrate a simple low-cost method to achieve a considerable increase in device brightness and efficiency.

Original language	English
Pages (from-to)	454-458
Number of pages	5
Journal	Journal of Luminescence
Volume	213
DOIs	https://doi.org/10.1016/j.jlumin.2019.05.058
State	Published - 1 Sep 2019

Keywords

Ce:YAG
Ceramic phosphors
External quantum efficiency
Photoluminescence
Surface roughness

ASJC Scopus subject areas

Biophysics
Atomic and Molecular Physics, and Optics
General Chemistry
Biochemistry
Condensed Matter Physics

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10.1016/j.jlumin.2019.05.058

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title = "Enhanced external luminescence quantum efficiency of ceramic phosphors by surface roughening",

abstract = "Ceramic phosphors show great promise for the realization of advanced high-power lighting devices. In the present work, ceramic Ce:YAG, which acts as a phosphor in white LEDs, was chosen as a case study to investigate the effect of surface roughness on the photoluminescence of ceramic phosphors. Highly transparent samples were fabricated by spark plasma sintering (SPS)and uniformly roughened with different grit size abrasive grinding paper. The average roughness (Ra)ranged from the nano-to the microscale (30–1570 nm). Photoluminescence (PL)emission intensity and external quantum efficiency (EQE)were found to significantly increase with surface roughness by 60 and 100%, respectively. Thus, we demonstrate a simple low-cost method to achieve a considerable increase in device brightness and efficiency.",

keywords = "Ce:YAG, Ceramic phosphors, External quantum efficiency, Photoluminescence, Surface roughness",

author = "Avital Wagner and Barak Ratzker and Sergey Kalabukhov and Nachum Frage",

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doi = "10.1016/j.jlumin.2019.05.058",

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journal = "Journal of Luminescence",

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T1 - Enhanced external luminescence quantum efficiency of ceramic phosphors by surface roughening

AU - Wagner, Avital

AU - Ratzker, Barak

AU - Kalabukhov, Sergey

AU - Frage, Nachum

PY - 2019/9/1

Y1 - 2019/9/1

N2 - Ceramic phosphors show great promise for the realization of advanced high-power lighting devices. In the present work, ceramic Ce:YAG, which acts as a phosphor in white LEDs, was chosen as a case study to investigate the effect of surface roughness on the photoluminescence of ceramic phosphors. Highly transparent samples were fabricated by spark plasma sintering (SPS)and uniformly roughened with different grit size abrasive grinding paper. The average roughness (Ra)ranged from the nano-to the microscale (30–1570 nm). Photoluminescence (PL)emission intensity and external quantum efficiency (EQE)were found to significantly increase with surface roughness by 60 and 100%, respectively. Thus, we demonstrate a simple low-cost method to achieve a considerable increase in device brightness and efficiency.

AB - Ceramic phosphors show great promise for the realization of advanced high-power lighting devices. In the present work, ceramic Ce:YAG, which acts as a phosphor in white LEDs, was chosen as a case study to investigate the effect of surface roughness on the photoluminescence of ceramic phosphors. Highly transparent samples were fabricated by spark plasma sintering (SPS)and uniformly roughened with different grit size abrasive grinding paper. The average roughness (Ra)ranged from the nano-to the microscale (30–1570 nm). Photoluminescence (PL)emission intensity and external quantum efficiency (EQE)were found to significantly increase with surface roughness by 60 and 100%, respectively. Thus, we demonstrate a simple low-cost method to achieve a considerable increase in device brightness and efficiency.

KW - Ce:YAG

KW - Ceramic phosphors

KW - External quantum efficiency

KW - Photoluminescence

KW - Surface roughness

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EP - 458

JO - Journal of Luminescence

JF - Journal of Luminescence

ER -

Enhanced external luminescence quantum efficiency of ceramic phosphors by surface roughening

Abstract

Keywords

ASJC Scopus subject areas

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