Luminescence Property and LED Device Application for Color-tunable Ca2LaTaO6∶Dy3+，Sm3+ Phosphor Based on Energy Transfer

doi:10.7503/cjcu20210380

Abstract

Abstract:

A series of Dy³⁺， Sm³⁺ co-doped double perovskite Ca₂LaTaO₆（CLTO） white light emitting diodes（WLED） phosphors with tunable color was designed by solid state reaction method. The crystal structure parameters of Ca₂LaTaO₆ and the lattice occupation for Dy³⁺， Sm³⁺ ions in the host were determined through Rietveld refinement， and the band gap was calculated by density functional theory（DFT）. Meanwhile， the energy migration from Dy³⁺ to Sm³⁺was confirmed by the aids of emission/excitation spectra and luminescent decay measurements. The mechanism of energy transfer was explored to be the resonant type via a dipole-dipole interaction and the critical distances between Dy³⁺ and Sm³⁺ were calculated to be 1.176 nm. Based on the energy transfer for Dy³⁺→Sm³⁺， by tuning the molarity ratio of doping Dy³⁺/Sm³⁺ ions， multicolor emission from yellow to yellow-red and white light shall be achieved in Ca₂LaTaO₆∶Dy³⁺， Sm³⁺ phosphors. Finally， white light-emitting diode prototypes were fabricated using as-prepared phosphors and UV chips， the luminescence efficiency， CIE chromaticity coordinates， correlated color temperature（CCT） and color rendering index （CRI） of the LED prototype were exhibited. The results indicated that these phosphors had potential application in UV white LED.

Key words: Ca₂LaTaO₆, Energy transfer, Color point tuning, LED device

CLC Number:

O611

TrendMD:

YUAN Bo, QI Chaochao, ZHANG Xiangting, LUAN Guoyan, ZOU Haifeng. Luminescence Property and LED Device Application for Color-tunable Ca₂LaTaO₆∶Dy³⁺，Sm³⁺ Phosphor Based on Energy Transfer[J]. Chem. J. Chinese Universities, 2021, 42(9): 2717.

Figures/Tables 12

References 36

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Crystal system	Monoclinic	β/（°）	90.0730
Space group	P121/n₁（14）	γ/（°）	90
a/nm	0.5671120	V/nm³	0.27235
b/nm	0.5883707	R_p（%）	9.97
c/nm	0.8162113	R_wp（%）	7.75
α/（°）	90	χ²	3.3

Crystal system	Monoclinic	β/（°）	90.0730
Space group	P121/n₁（14）	γ/（°）	90
a/nm	0.5671120	V/nm³	0.27235
b/nm	0.5883707	R_p（%）	9.97
c/nm	0.8162113	R_wp（%）	7.75
α/（°）	90	χ²	3.3

Atom	x	y	z	SOF
Ca1	?0.012300	0.448100	0.252910	0.5
Ca2	0.5000	0.5000	0.0000	1
La1	-0.014422	0.446954	0.250897	0.3072
Dy1	-0.014422	0.446954	0.250897	0.1928
Ta1	0.0000	0.0000	0.0000	1
O1	0.713500	0.177400	0.049400	1
O2	0.672300	0.218400	0.434900	1
O3	0.108900	0.049600	0.229400	1

Atom	x	y	z	SOF
Ca1	?0.012300	0.448100	0.252910	0.5
Ca2	0.5000	0.5000	0.0000	1
La1	-0.014422	0.446954	0.250897	0.3072
Dy1	-0.014422	0.446954	0.250897	0.1928
Ta1	0.0000	0.0000	0.0000	1
O1	0.713500	0.177400	0.049400	1
O2	0.672300	0.218400	0.434900	1
O3	0.108900	0.049600	0.229400	1

Number	Sample	CIE （x， y）	Color	Number	Sample	CIE （x， y）	Color
1	CLTO∶7%Dy³⁺	（0.375， 0.527）	Yellow	5	CLTO∶7%Dy³⁺， 9%Sm³⁺	（0.418， 0.352）	White
2	CLTO∶7%Dy³⁺， 1%Sm³⁺	（0.386， 0.487）	Yellow	6	CLTO∶7%Dy³⁺， 11%Sm³⁺	（0.465， 0.330）	Yellow?red
3	CLTO∶7%Dy³⁺， 5%Sm³⁺	（0.389， 0.447）	Yellow	7	CLTO∶7%Dy³⁺， 9%Sm³⁺ LED device	（0.379， 0.343）	White
4	CLTO∶7%Dy³⁺， 7%Sm³⁺	（0.410， 0.405）	Yellow

Luminescence Property and LED Device Application for Color-tunable Ca₂LaTaO₆∶Dy³⁺，Sm³⁺ Phosphor Based on Energy Transfer

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