Photoluminescence properties of Ca4La6(SiO4)4(PO4)2O2-based phosphors for wLEDs

Fig. 1. (a) XRD patterns of the samples. (b) Locally enlarged view of (a). (c) XRD refinement for the CLSPO host. (d) Crystal structure of CLSPO host along the $c$ -axis direction, and the coordinated environments of Ca/La(I) and Ca/La(II) atoms. (e) Diffuse reflection spectrum of CLSPO host. Inset: bandgap value of CLSPO obtained with the K–M function and the Tauc relation.

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Fig. 2. (a) Normalized PLE and PL spectra of CLSPO: $0.90 {Eu}^{3 +}$ phosphor. (b) PL spectra of CLSPO: $x {Eu}^{3 +}$ samples. Inset: the emission intensity and ( $I_{R} / I_{O}$ ) value versus $x$ .

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Fig. 3. (a) Normalized PLE and PL spectra of CLSPO: $0.90 {Tb}^{3 +}$ phosphor. (b) PL spectra of CLSPO: $x {Tb}^{3 +}$ samples. Inset: the emission intensity versus ${Tb}^{3 +}$ concentration $x$ .

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Fig. 4. (a) Normalized PLE (blue line) and PL (red line) spectra of CLSPO: $0.40 {Mn}^{2 +}$ , PL spectrum (green line) of CLSPO: $0.90 {Tb}^{3 +}$ . Insets: left, PLE spectra of CLSPO: $0.90 {Tb}^{3 +}$ , $0.52 {Mn}^{2 +}$ monitored at different wavelengths; right, the schematic of ET from ${Tb}^{3 +}$ to ${Mn}^{2 +}$ in the CLSPO host. (b) PL spectra of CLSPO: $0.90 {Tb}^{3 +}$ , $x {Mn}^{2 +}$ samples and the photos of the samples under 365 nm lamp.

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Fig. 5. CIE chromaticity diagram for CLSPO: $0.90 {Eu}^{3 +}$ (Point A) and CLSPO: $0.90 {Tb}^{3 +}$ , $y {Mn}^{2 +}$ (Points B–H). Photos: ${Eu}^{3 +} / {Tb}^{3 +}$ -doped CLSPO phosphors under 365 nm UV lamps.

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Ju Cheng, Jia Zhang, Jian Lu, Xintian Bian, Hongchao Zhang, Zhonghua Shen, Xiaowu Ni, Pengcheng Ma, Jin Shi. Photoluminescence properties of Ca₄La₆(SiO₄)₄(PO₄)₂O₂-based phosphors for wLEDs[J]. Chinese Optics Letters, 2019, 17(5): 051602

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Paper Information

Category: Materials

Received: Dec. 30, 2018

Accepted: Feb. 22, 2019

Published Online: May. 23, 2019

The Author Email: Jia Zhang (zhangjianew@126.com), Jian Lu (lj6805@163.com)

DOI:10.3788/COL201917.051602

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology