Microstructured interface modification of laser-driven phosphor-in-glass-film for ultra-high-efficiency white lighting

Zhao, Jiuzhou; Mou, Yun; Yu, Zikang; Hao, Ziliang; Hu, Huixuan; Shi, Jianhong; Chen, Mingxiang; Peng, Yang

doi:10.1016/j.jallcom.2023.170744

Cited by 22 publications

(2 citation statements)

References 34 publications

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“…Typically used power LEDs are phosphor-converted white light sources. The properties of phosphor used in such devices have been analyzed, e.g., in [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…Paper [9] presents a modification of the phosphor used in laser semiconductor light sources, the modification of which allows an increase in the efficiency of the conversion of the supplied electric energy into the emitted light by as much as 11% compared with traditional semiconductor light sources. The described modification consists of using a sapphire substrate with a thickness of 80 µm.…”

Section: Introductionmentioning

confidence: 99%

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An Influence of Parameters of the Control Signal of Power LEDs on Their Junction Temperature and Emitted Light

Górecki,

Ptak,

Gensikowski

2023

Energies

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This article presents the method of implementation and the results of experimental investigations illustrating an influence of parameters of the signal controlling the current flowing through power LEDs on their junction temperature and on parameters characterizing the light emitted by them. The measurement system used and the tested power LEDs are described. The results of measurements of the junction temperature of the tested devices, the values of the average value of the power dissipated in the tested devices and the photometric and radiometric parameters of these devices obtained for different values of frequency and the duty cycle of the signal controlling the current flowing through the tested diodes are presented and discussed. It is shown that the operation of the considered semiconductor devices is more effective at low frequency values. The possibility of adjusting the optical parameters of the power LEDs in the considered range of frequency and the duty cycle adjustment is assessed. Additionally, the measured waveforms of the current supplying the tested LEDs is shown. The influence of the parasitic capacitances of the tested devices is discussed. On the basis of the obtained investigation results, some recommendations for the designers of lighting systems can be formulated. In order to obtain an almost linear dependence of the illuminance on the duty cycle, the values of frequency not exceeding 10 kHz should be used.

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“…Typically used power LEDs are phosphor-converted white light sources. The properties of phosphor used in such devices have been analyzed, e.g., in [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Influence of Parameters of the Control Signal of Power LEDs on Their Junction Temperature and Emitted Light

Górecki,

Ptak,

Gensikowski

2023

Energies

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A Novel Sapphire@PiGF@Sapphire Color Converter with High Luminescence Saturation Threshold for Laser Lighting

Zhang,

Zhao,

et al. 2024

Adv Funct Materials

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Next‐generation high‐brightness laser lighting confronts a key challenge in preparing static color‐converting materials with remarkable luminescence saturation. Herein, a novel architecture of transmissive Y3Al5O12: Ce3+ (YAG) phosphor‐in‐glass film (PiGF) with double‐sided sapphires, i.e., a sandwich structured sapphire@PiGF@sapphire (S@PiGF@S) composite, is designed and fabricated by a thermocompression sintering technology. This kind of material can tolerate high laser power density (LPD) for the efficient double‐sided thermal channels and the high‐energy laser spot away from the PiGF emitting layer. As a consequence, the optimized S@PiGF@S color converter yields white light with a high luminous flux (LF) of 7602 lm at a record luminescence saturation threshold of 46.47 W·mm−2 benefiting from its low working temperature of merely 284 °C, which is 6.3 times that of traditional PiGF@sapphire color converter (1205 lm@10.89 W·mm−2). These findings verify that the developed S@PiGF@S color converter enables preferably optical‐thermal performances for promising applications in high‐brightness laser lighting.

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A Novel PiGF@Diamond Color Converter with a Record Thermal Conductivity for Laser‐Driven Projection Display

Yu,

Zhao,

Yang

et al. 2024

Advanced Materials

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High‐brightness laser lighting is confronted with crucial challenges in developing laser‐excitable color converting materials with effective heat dissipation and super optical performance. Herein, a novel composite of phosphor‐in‐glass film on transparent diamond (PiGF@diamond) is designed and fabricated via a facile low‐temperature co‐sintering strategy. The as‐prepared La3Si6N11:Ce3+ (LSN:Ce) PiGF@diamond with well‐retained optical properties of raw phosphor shows a record thermal conductivity of ≈599 W m−1 K−1, which is about 60 times higher than that of currently well‐used PiGF@sapphire (≈10 W m−1 K−1). As a consequence, this color converter can bear laser power density up to 40.24 W mm−2 and a maximum luminance flux of 5602 lm without luminescence saturation due to efficient inhibition of laser‐induced heat accumulation. By further supplementing red spectral component of CaAlSiN3:Eu2+ (CASN:Eu), the PiGF@diamond based white laser diode is successfully constructed, which can yield warm white light with a high color rendering index of 89.3 and find practical LD‐driven applications. The findings will pave the way for realizing the commercial application of PiGF composite in laser lighting and display.

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Microstructured interface modification of laser-driven phosphor-in-glass-film for ultra-high-efficiency white lighting

Cited by 22 publications

References 34 publications

An Influence of Parameters of the Control Signal of Power LEDs on Their Junction Temperature and Emitted Light

An Influence of Parameters of the Control Signal of Power LEDs on Their Junction Temperature and Emitted Light

A Novel Sapphire@PiGF@Sapphire Color Converter with High Luminescence Saturation Threshold for Laser Lighting

A Novel PiGF@Diamond Color Converter with a Record Thermal Conductivity for Laser‐Driven Projection Display

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