Ce:GdYAG phosphor-in-glass: An innovative yellow-emitting color converter for solid-state laser lighting

doi:10.1016/j.jmst.2022.06.025

Abstract

Abstract:

Stable, efficient and high color rendering index all-inorganic color converters are urgently demanded for white laser diodes. Phosphor-in-glass (PiG), possessing the advantages of phosphors excellent quantum efficiency as well as favorable chemical and thermal stability of glass, has attracted widespread attention. There have been only very few reports of Y_1.31Ce_0.09Gd_1.6Al₅O₁₂ (Ce:GdYAG) PiG for solid-state laser lighting. Herein, a series of Ce:GdYAG PiG samples are fabricated by a simple solid-state sintering method. Impressively, the supreme internal quantum efficiency of as-prepared PiG is 91%, which is very close to original phosphors (95%). Furthermore, PiG exhibits a high thermal conductivity (1.844 W m⁻¹ K⁻¹) and a maximum transparency (62%). Remarkably, by changing the concentration of phosphors and the thickness of PiG samples, a luminous efficacy of 163.5 lm/W, high color rendering index of 74.8 and low correlated color temperature of 4806.8 K are achieved under blue laser irradiation. These results indicate that the Ce:GdYAG PiG samples have shown tremendous application foreground as all-inorganic color converter for solid-state laser lighting.

Key words: Ce:GdYAG, Phosphor-in-glass, Solid-state laser lighting, Optical performance

Luhan Wang, Jiangdan Zhang, Li Xu, Shuyang Bao, Yu Wang, Jiawei Liu, Xiaojuan Liang, Weidong Xiang. Ce:GdYAG phosphor-in-glass: An innovative yellow-emitting color converter for solid-state laser lighting[J]. J. Mater. Sci. Technol., 2023, 134: 42-49.

Figures/Tables 7

Fig. 1. (a) Schematic diagram of the preparation process for Ce:GdYAG PiG samples. (b) Photographs of the PiG samples with 5-50 wt% Ce:GdYAG phosphors under Daylight (left) and 365 nm UV light (right).

Fig. 2. (a) XRD patterns of phosphors and a series of Ce:GdYAG PiG samples with different content phosphors. (b) and (c) TEM images of 40 wt% Ce:GdYAG PiG. (d) and (e) HRTEM images of 40 wt% Ce:GdYAG PiG.

Fig. 3. (a) SEM and (b) CL images of the 40 wt% PiG sample. (c) CL spectra of points 1-4 collected from the marked area in (b). (d) Corresponding EDS mappings. (e) SEM image and (f) in-line EDS for the 40 wt% PiG sample.

Fig. 4. (a) PLE and PL emission spectra of Ce:GdYAG phosphors and 40 wt% PiG. (b) Energy levels diagram of Ce3+ in Ce:GdYAG. (c) IQE of PiG samples versus the content of phosphors. (d) The transmittance curves of PiG samples (thickness: 0.15 mm) with 5-50 wt% phosphors concentrations.

Fig. 5. Temperature-dependent PL spectra of (a) Ce:GdYAG phosphors and (b) 40 wt% PiG sample. (c) Relative PL intensities of Ce:GdYAG phosphors and 40 wt% PiG sample recorded from 298 to 523 K. (d) Thermal conductivity and thermal diffusivity of the 40 wt% PiG sample at various temperatures (298-548 K).

Fig. 6. (a) LF and LE (b) CCT and CRI (c) electroluminescence (EL) emission spectra of 5-50 wt% PiG samples (thickness: 0.8 mm) under 0.634 W/mm2 laser irradiation. (d) LF and LE (e) CCT and CRI (f) EL emission spectra of 0.4-1.2 mm PiG samples (10 wt%) under 0.634 W/mm2 laser irradiation.

Fig. 7. (a) The changes of LF relative to the incident laser power density for the PiG sample (10 wt%, 0.8 mm). (b) EL spectra, (c) color coordinates (CIE) of the PiG sample (10 wt%, 0.8 mm) under different blue laser excitation. (d) Photographs of prototype LDs (combining blue LDs and 5-50 wt% Ce:GdYAG PiG) out operation and in operation.

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