White-light emission from near UV InGaN-GaN LED chip precoated with blue/green/red phosphors

J. K. Sheu; S. J. Chang; Cheng-Huang Kuo; Y. K. Su; L. W. Wu; Y. C. Lin; W. C. Lai; J. M. Tsai; G. C. Chi; R. K. Wu

doi:10.1109/LPT.2002.805852

White-light emission from near UV InGaN-GaN LED chip precoated with blue/green/red phosphors

J. K. Sheu^*, S. J. Chang, Cheng-Huang Kuo, Y. K. Su, L. W. Wu, Y. C. Lin, W. C. Lai, J. M. Tsai, G. C. Chi, R. K. Wu

^*Corresponding author for this work

Institute of Lighting and Energy Photonics

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

697 Scopus citations

Abstract

Phosphor-converted light-emitting diodes (LEDs) were fabricated by precoating blue/green/red phosphors onto near ultraviolate (n-UV) LED chips prior to package into LED lamps. With a 20-mA injection current, it was found that the color temperature T_c was around 5900 K and the color-rendering index R_a was around 75 for the "n-UV+blue/green/red" white LED lamps. It was also found that no changes in color temperature T_c color-rendering index R_a could be observed when we increased the injection from 20 to 60 mA. These results indicate that such "n-UV+blue/green/red" white LEDs are much more optically stable than the conventional "blue+yellow" LEDs.

Original language	English
Pages (from-to)	18-20
Number of pages	3
Journal	IEEE Photonics Technology Letters
Volume	15
Issue number	1
DOIs	https://doi.org/10.1109/LPT.2002.805852
State	Published - Jan 2003

Keywords

Color temperature
Color-rendering index
GaN
Phosphor
White-light light-emitting diode (LED)

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10.1109/LPT.2002.805852

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@article{75b34c3e12994c549188a9361a9c30a6,

title = "White-light emission from near UV InGaN-GaN LED chip precoated with blue/green/red phosphors",

abstract = "Phosphor-converted light-emitting diodes (LEDs) were fabricated by precoating blue/green/red phosphors onto near ultraviolate (n-UV) LED chips prior to package into LED lamps. With a 20-mA injection current, it was found that the color temperature Tc was around 5900 K and the color-rendering index Ra was around 75 for the {"}n-UV+blue/green/red{"} white LED lamps. It was also found that no changes in color temperature Tc color-rendering index Ra could be observed when we increased the injection from 20 to 60 mA. These results indicate that such {"}n-UV+blue/green/red{"} white LEDs are much more optically stable than the conventional {"}blue+yellow{"} LEDs.",

keywords = "Color temperature, Color-rendering index, GaN, Phosphor, White-light light-emitting diode (LED)",

author = "Sheu, {J. K.} and Chang, {S. J.} and Cheng-Huang Kuo and Su, {Y. K.} and Wu, {L. W.} and Lin, {Y. C.} and Lai, {W. C.} and Tsai, {J. M.} and Chi, {G. C.} and Wu, {R. K.}",

year = "2003",

month = jan,

doi = "10.1109/LPT.2002.805852",

language = "English",

volume = "15",

pages = "18--20",

journal = "IEEE Photonics Technology Letters",

issn = "1041-1135",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

number = "1",

}

TY - JOUR

T1 - White-light emission from near UV InGaN-GaN LED chip precoated with blue/green/red phosphors

AU - Sheu, J. K.

AU - Chang, S. J.

AU - Kuo, Cheng-Huang

AU - Su, Y. K.

AU - Wu, L. W.

AU - Lin, Y. C.

AU - Lai, W. C.

AU - Tsai, J. M.

AU - Chi, G. C.

AU - Wu, R. K.

PY - 2003/1

Y1 - 2003/1

N2 - Phosphor-converted light-emitting diodes (LEDs) were fabricated by precoating blue/green/red phosphors onto near ultraviolate (n-UV) LED chips prior to package into LED lamps. With a 20-mA injection current, it was found that the color temperature Tc was around 5900 K and the color-rendering index Ra was around 75 for the "n-UV+blue/green/red" white LED lamps. It was also found that no changes in color temperature Tc color-rendering index Ra could be observed when we increased the injection from 20 to 60 mA. These results indicate that such "n-UV+blue/green/red" white LEDs are much more optically stable than the conventional "blue+yellow" LEDs.

AB - Phosphor-converted light-emitting diodes (LEDs) were fabricated by precoating blue/green/red phosphors onto near ultraviolate (n-UV) LED chips prior to package into LED lamps. With a 20-mA injection current, it was found that the color temperature Tc was around 5900 K and the color-rendering index Ra was around 75 for the "n-UV+blue/green/red" white LED lamps. It was also found that no changes in color temperature Tc color-rendering index Ra could be observed when we increased the injection from 20 to 60 mA. These results indicate that such "n-UV+blue/green/red" white LEDs are much more optically stable than the conventional "blue+yellow" LEDs.

KW - Color temperature

KW - Color-rendering index

KW - GaN

KW - Phosphor

KW - White-light light-emitting diode (LED)

UR - http://www.scopus.com/inward/record.url?scp=0037248675&partnerID=8YFLogxK

U2 - 10.1109/LPT.2002.805852

DO - 10.1109/LPT.2002.805852

M3 - Article

AN - SCOPUS:0037248675

SN - 1041-1135

VL - 15

SP - 18

EP - 20

JO - IEEE Photonics Technology Letters

JF - IEEE Photonics Technology Letters

IS - 1

ER -

White-light emission from near UV InGaN-GaN LED chip precoated with blue/green/red phosphors

Abstract

Keywords

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