Orange-red-emitting (Sr,Ba)3SiO5:Eu2+ phosphor-in-glass film for enhanced color rendering of laser lighting

Su, Rongtao; Zhu, Qiangqiang; Mei, Hang; Fang, Shuangqiang; Zhai, Yue; Liang, Pei; Zhang, Hong; Wang, Le

doi:10.1016/j.jlumin.2023.120080

Cited by 6 publications

(1 citation statement)

References 31 publications

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“…For Al 2 O 3 -YAG:Ce phosphor ceramics achieved at 1460 and 1490 °C, due to the large size pores, the emission from phosphor particles was scattered, resulting in lower QE test results. 29 When the sintering temperature reached 1520 °C, the ceramic samples exhibited the highest IQE of 86.7%, reaching 96.1% of the original YAG:Ce phosphor. When the fabrication temperature increased to 1550 °C, a decrease in IQE can be observed owing to the further deterioration of the phosphor particles at high temperature.…”

Section: Resultsmentioning

confidence: 95%

Investigation of Excitation Modes in Al₂O₃-YAG Phosphor Ceramics for High-Power Laser-Driven Lighting

Shen,

Zhu,

Tian

et al. 2024

ECS J. Solid State Sci. Technol.

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The performance of laser-driven white light can vary significantly depending on the excitation mode. To attain desirable application performance of color converters in laser lighting, the excitation mode must be selected carefully. In this work, to understand the effect of the excitation mode on the performance of color converters, a detailed study was conducted on the heat dispersion, luminescence, and color quality of Al2O3-YAG:Ce phosphor ceramics in both transmissive and reflective modes. The relationship between ceramic porosity and scattering performance has also been analyzed by studying the beam expansion ratio. The results demonstrate that the phosphor ceramics in reflective mode exhibit superior heat dissipation capabilities and can withstand higher power laser excitation compared to the transmissive mode, while the light uniformity is relatively poorer due to the specular reflection. Therefore, in situations where a uniform light is not necessary, reflective color converters are more suitable for achieving superior luminance and luminous efficacy. Finally, a laser-driven white light device with a luminous flux of 1206 lm, a luminous efficacy of 241.2 lm/W, and a CCT of 5749 K has been realized using Al2O3-YAG:Ce phosphor ceramic in reflective mode, which can be applied for automotive headlights.

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Section: Resultsmentioning

confidence: 95%

Investigation of Excitation Modes in Al₂O₃-YAG Phosphor Ceramics for High-Power Laser-Driven Lighting

Shen,

Zhu,

Tian

et al. 2024

ECS J. Solid State Sci. Technol.

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Innovative Architecture for Phosphor‐in‐Glass Films Enabling Superior Luminance and Color Quality Laser‐Driven White Light

Wang,

Zhu,

Nie

et al. 2024

Laser & Photonics Reviews

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Laser‐driven white light exhibits exceptional brightness and directionality, making it particularly well‐suited for spotlight applications. Yet, attaining high‐quality white light remains challenging due to the sluggish heat dispersion and inconsistent light uniformity of color converters. In this study, an innovative phosphor‐in‐glass (PiG) film architecture is introduced, aiming to achieve superior quality laser‐driven light, where the traditional Y3(Ga,Al)5O12:Ce3+ (YAGG:Ce3+) PiG film is topped with a Al2O3‐in‐glass (AiG) film. The heightened thermal conductivity of the AiG film facilitates quicker dissipation of heat, consequently elevating the luminescence saturation threshold from 14 to 16 W mm−2 and luminous flux from 1243.8 to 1475.9 lm. The increased light scattering attributed to the AiG film also effectively disperses both laser and emitted light, significantly enhancing the angular consistency of color rendering index (Ra). This improvement is evident as the coefficient of variation (Cv) decreases dramatically from 16.69% to 0.25%. Moreover, by integrating CaAlSiN3:Eu2+ (CASN:Eu2+) into the PiG film and fine‐tuning the YAGG:Ce3+ and CASN:Eu2+ ratio, a high‐quality laser‐driven white light achieving an impressive color rendering index (Ra) of 88.7 and offering an adjustable correlated color temperature (CCT) has been developed. This innovation holds tremendous potential as a versatile spotlight solution for both indoor and outdoor settings.

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Advancing High‐Power Laser Lighting: Designing a Novel YAGG:Ce Color Converter in Li–Al–Si Glass Ceramic

Zheng,

Liu,

Liang

et al. 2024

Laser & Photonics Reviews

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In laser illumination, there is considerable interest in phosphor‐converted laser diodes that boast high efficiency and exceptional thermal stability. Phosphor‐in‐glass (PiG) and phosphor‐in‐glass film (PiF) are highly favored for their efficiency, cost‐effectiveness, and ease of fabrication. To tackle the issue of low thermal conductivity of glass, a novel lithium–aluminum–silicate glass is innovatively developed. This glass induces the precipitation of spodumene crystalline phase, enhancing material stability. Utilizing solid‐state sintering techniques, Y3Al3.5Ga1.5O12:Ce3+ (YAGG:Ce) PiG is fabricated, which exhibited a luminous flux (LF) of 866.76 lm under 450 nm blue light with 3.88 W input power. Benefiting from the high thermal conductivity of sapphire substrate and the high‐intensity glass system, YAGG:Ce PiF demonstrated a saturation threshold of 10.20 W, yielding an impressive LF of 2178.1 lm, which is 2.5 times that of PiG samples. Notably, the thermal conductivity increased significantly from 2.2 W m−1K−1 (PiG) to 7.0 W m−1K−1 (PiF), surpassing traditional organic resin materials. To validate the practicality of the two‐color converters, it integrates them into both starlight lamp and laser flashlight modules for encapsulation, thereby generating attractive green light in various environments. This design holds the potential to become the ideal choice for the next generation of high‐power, high‐brightness laser illumination.

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Orange-red-emitting (Sr,Ba)3SiO5:Eu2+ phosphor-in-glass film for enhanced color rendering of laser lighting

Cited by 6 publications

References 31 publications

Investigation of Excitation Modes in Al₂O₃-YAG Phosphor Ceramics for High-Power Laser-Driven Lighting

Investigation of Excitation Modes in Al₂O₃-YAG Phosphor Ceramics for High-Power Laser-Driven Lighting

Innovative Architecture for Phosphor‐in‐Glass Films Enabling Superior Luminance and Color Quality Laser‐Driven White Light

Advancing High‐Power Laser Lighting: Designing a Novel YAGG:Ce Color Converter in Li–Al–Si Glass Ceramic

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Orange-red-emitting (Sr,Ba)3SiO5:Eu2+ phosphor-in-glass film for enhanced color rendering of laser lighting

Cited by 6 publications

References 31 publications

Investigation of Excitation Modes in Al2O3-YAG Phosphor Ceramics for High-Power Laser-Driven Lighting

Investigation of Excitation Modes in Al2O3-YAG Phosphor Ceramics for High-Power Laser-Driven Lighting

Innovative Architecture for Phosphor‐in‐Glass Films Enabling Superior Luminance and Color Quality Laser‐Driven White Light

Advancing High‐Power Laser Lighting: Designing a Novel YAGG:Ce Color Converter in Li–Al–Si Glass Ceramic

Contact Info

Product

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Investigation of Excitation Modes in Al₂O₃-YAG Phosphor Ceramics for High-Power Laser-Driven Lighting

Investigation of Excitation Modes in Al₂O₃-YAG Phosphor Ceramics for High-Power Laser-Driven Lighting