Improving the performance of power GaN-based thin-film flip-chip LEDs through a twofold roughened surface

Tseng Hsing Lin; Shui Jinn Wang; Yung Chun Tu; Chien Hsiung Hung; Tsung Hsien Yu

doi:10.1016/j.mssp.2016.01.010

Improving the performance of power GaN-based thin-film flip-chip LEDs through a twofold roughened surface

Tseng Hsing Lin, Shui Jinn Wang, Yung Chun Tu, Chien Hsiung Hung, Tsung Hsien Yu

Institute of Microelectronics

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

15 Citations (Scopus)

Abstract

To further enhance the light extraction efficiency of GaN-based thin-film flip-chip light-emitting diodes (TFFC-LEDs), a surface roughening technique using KrF excimer laser ablation and chemical wet etching is demonstrated. Both optical ray-tracing simulations and experimental results of the light emission characteristics are presented and discussed. With the proposed twofold surface texturing scheme with circular protrusions superimposed by hexagonal cones, the angular randomization of photons at the emission surface was maximized, enhancements in light output power of 13.08% (12.81%) and wall-plug efficiency of 2.87% (2.25%) at 350 mA (700 mA) compared to those of a TFFC-LED without surface texturing were obtained.

Original language	English
Pages (from-to)	69-75
Number of pages	7
Journal	Materials Science in Semiconductor Processing
Volume	45
DOIs	https://doi.org/10.1016/j.mssp.2016.01.010
Publication status	Published - 2016 Apr 1

All Science Journal Classification (ASJC) codes

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1016/j.mssp.2016.01.010

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@article{75ae97e2f13343a4b36d482a512513e0,

title = "Improving the performance of power GaN-based thin-film flip-chip LEDs through a twofold roughened surface",

abstract = "To further enhance the light extraction efficiency of GaN-based thin-film flip-chip light-emitting diodes (TFFC-LEDs), a surface roughening technique using KrF excimer laser ablation and chemical wet etching is demonstrated. Both optical ray-tracing simulations and experimental results of the light emission characteristics are presented and discussed. With the proposed twofold surface texturing scheme with circular protrusions superimposed by hexagonal cones, the angular randomization of photons at the emission surface was maximized, enhancements in light output power of 13.08% (12.81%) and wall-plug efficiency of 2.87% (2.25%) at 350 mA (700 mA) compared to those of a TFFC-LED without surface texturing were obtained.",

author = "Lin, {Tseng Hsing} and Wang, {Shui Jinn} and Tu, {Yung Chun} and Hung, {Chien Hsiung} and Yu, {Tsung Hsien}",

note = "Funding Information: This work was supported by the Ministry of Science and Technology ( MOST ), Taiwan, under Grants MOST 104-2221-E-006-130-MY3 and MOST 104-2221-E-006-066 . Publisher Copyright: {\textcopyright} 2016 Elsevier Ltd. All rights reserved.",

year = "2016",

month = apr,

day = "1",

doi = "10.1016/j.mssp.2016.01.010",

language = "English",

volume = "45",

pages = "69--75",

journal = "Materials Science in Semiconductor Processing",

issn = "1369-8001",

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T1 - Improving the performance of power GaN-based thin-film flip-chip LEDs through a twofold roughened surface

AU - Lin, Tseng Hsing

AU - Wang, Shui Jinn

AU - Tu, Yung Chun

AU - Hung, Chien Hsiung

AU - Yu, Tsung Hsien

N1 - Funding Information: This work was supported by the Ministry of Science and Technology ( MOST ), Taiwan, under Grants MOST 104-2221-E-006-130-MY3 and MOST 104-2221-E-006-066 . Publisher Copyright: © 2016 Elsevier Ltd. All rights reserved.

PY - 2016/4/1

Y1 - 2016/4/1

N2 - To further enhance the light extraction efficiency of GaN-based thin-film flip-chip light-emitting diodes (TFFC-LEDs), a surface roughening technique using KrF excimer laser ablation and chemical wet etching is demonstrated. Both optical ray-tracing simulations and experimental results of the light emission characteristics are presented and discussed. With the proposed twofold surface texturing scheme with circular protrusions superimposed by hexagonal cones, the angular randomization of photons at the emission surface was maximized, enhancements in light output power of 13.08% (12.81%) and wall-plug efficiency of 2.87% (2.25%) at 350 mA (700 mA) compared to those of a TFFC-LED without surface texturing were obtained.

AB - To further enhance the light extraction efficiency of GaN-based thin-film flip-chip light-emitting diodes (TFFC-LEDs), a surface roughening technique using KrF excimer laser ablation and chemical wet etching is demonstrated. Both optical ray-tracing simulations and experimental results of the light emission characteristics are presented and discussed. With the proposed twofold surface texturing scheme with circular protrusions superimposed by hexagonal cones, the angular randomization of photons at the emission surface was maximized, enhancements in light output power of 13.08% (12.81%) and wall-plug efficiency of 2.87% (2.25%) at 350 mA (700 mA) compared to those of a TFFC-LED without surface texturing were obtained.

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U2 - 10.1016/j.mssp.2016.01.010

DO - 10.1016/j.mssp.2016.01.010

M3 - Article

AN - SCOPUS:84957570925

SN - 1369-8001

VL - 45

SP - 69

EP - 75

JO - Materials Science in Semiconductor Processing

JF - Materials Science in Semiconductor Processing

ER -

Improving the performance of power GaN-based thin-film flip-chip LEDs through a twofold roughened surface

Abstract

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