Spray pyrolysis prepared yellow to red color tunable Sr 1-xCaxSe:Eu2+ phosphors for white LED

Wonkeun Chung; Hyunchul Jung; Chang Hun Lee; Jihyun Kim; Sung Hyun Kim

doi:10.1364/OE.20.012885

Spray pyrolysis prepared yellow to red color tunable Sr _1-xCa_xSe:Eu²⁺ phosphors for white LED

Wonkeun Chung, Hyunchul Jung, Chang Hun Lee, Jihyun Kim, Sung Hyun Kim

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

7 Citations (Scopus)

Abstract

The spherical and submicron size of Sr_1-xCa_xSe: Eu²⁺ phosphors were successfully prepared by ultrasonic spray pyrolysis. The phosphors adopted a cubic structure, and the replacement of Sr²⁺ with Ca²⁺ decreased the lattice parameter. The Sr_1-xCa_xSe:Eu²⁺ showed broad and strong excitation under 420-460nm blue light, and the emission band could be tuned from 565 to 607nm by increasing the Ca²⁺ ratio in the host lattice. In addition, the doping of Zn²⁺ into Sr²⁺ or Ca²⁺ enhanced the emission intensity with a small red shift due to the change in crystal field strength and nephelauxetic effects. The warm and high CRI of white LED was achieved using blue LED pumped with blending phosphors of 612nm emitting Ca0.98Zn0.02Se:Eu²⁺ and 565nm emitting YAG. The correlated color temperatures and CRI were 4719.2K, and 86.3, respectively, and an acceptable color variation was also observed at operating currents ranging from 20 to 70mA.

Original language	English
Pages (from-to)	12885-12892
Number of pages	8
Journal	Optics Express
Volume	20
Issue number	12
DOIs	https://doi.org/10.1364/OE.20.012885
Publication status	Published - 2012 Jun 4

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics

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title = "Spray pyrolysis prepared yellow to red color tunable Sr 1-xCaxSe:Eu2+ phosphors for white LED",

abstract = "The spherical and submicron size of Sr1-xCaxSe: Eu2+ phosphors were successfully prepared by ultrasonic spray pyrolysis. The phosphors adopted a cubic structure, and the replacement of Sr2+ with Ca2+ decreased the lattice parameter. The Sr1-xCaxSe:Eu2+ showed broad and strong excitation under 420-460nm blue light, and the emission band could be tuned from 565 to 607nm by increasing the Ca2+ ratio in the host lattice. In addition, the doping of Zn2+ into Sr2+ or Ca2+ enhanced the emission intensity with a small red shift due to the change in crystal field strength and nephelauxetic effects. The warm and high CRI of white LED was achieved using blue LED pumped with blending phosphors of 612nm emitting Ca0.98Zn0.02Se:Eu2+ and 565nm emitting YAG. The correlated color temperatures and CRI were 4719.2K, and 86.3, respectively, and an acceptable color variation was also observed at operating currents ranging from 20 to 70mA.",

author = "Wonkeun Chung and Hyunchul Jung and Lee, {Chang Hun} and Jihyun Kim and Kim, {Sung Hyun}",

year = "2012",

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T1 - Spray pyrolysis prepared yellow to red color tunable Sr 1-xCaxSe:Eu2+ phosphors for white LED

AU - Chung, Wonkeun

AU - Jung, Hyunchul

AU - Lee, Chang Hun

AU - Kim, Jihyun

AU - Kim, Sung Hyun

PY - 2012/6/4

Y1 - 2012/6/4

N2 - The spherical and submicron size of Sr1-xCaxSe: Eu2+ phosphors were successfully prepared by ultrasonic spray pyrolysis. The phosphors adopted a cubic structure, and the replacement of Sr2+ with Ca2+ decreased the lattice parameter. The Sr1-xCaxSe:Eu2+ showed broad and strong excitation under 420-460nm blue light, and the emission band could be tuned from 565 to 607nm by increasing the Ca2+ ratio in the host lattice. In addition, the doping of Zn2+ into Sr2+ or Ca2+ enhanced the emission intensity with a small red shift due to the change in crystal field strength and nephelauxetic effects. The warm and high CRI of white LED was achieved using blue LED pumped with blending phosphors of 612nm emitting Ca0.98Zn0.02Se:Eu2+ and 565nm emitting YAG. The correlated color temperatures and CRI were 4719.2K, and 86.3, respectively, and an acceptable color variation was also observed at operating currents ranging from 20 to 70mA.

AB - The spherical and submicron size of Sr1-xCaxSe: Eu2+ phosphors were successfully prepared by ultrasonic spray pyrolysis. The phosphors adopted a cubic structure, and the replacement of Sr2+ with Ca2+ decreased the lattice parameter. The Sr1-xCaxSe:Eu2+ showed broad and strong excitation under 420-460nm blue light, and the emission band could be tuned from 565 to 607nm by increasing the Ca2+ ratio in the host lattice. In addition, the doping of Zn2+ into Sr2+ or Ca2+ enhanced the emission intensity with a small red shift due to the change in crystal field strength and nephelauxetic effects. The warm and high CRI of white LED was achieved using blue LED pumped with blending phosphors of 612nm emitting Ca0.98Zn0.02Se:Eu2+ and 565nm emitting YAG. The correlated color temperatures and CRI were 4719.2K, and 86.3, respectively, and an acceptable color variation was also observed at operating currents ranging from 20 to 70mA.

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Spray pyrolysis prepared yellow to red color tunable Sr _1-xCa_xSe:Eu²⁺ phosphors for white LED

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