Design of laser-driven SiO2-YAG:Ce composite thick film: Facile synthesis, robust thermal performance, and application in solid-state laser lighting

Xu, Jian; Liu, Bingguo; Liu, Zhiwen; Gong, Yuxuan; Hu, Baofu; Wang, Jian; Li, Hui; Wang, Xinliang

doi:10.1016/j.optmat.2017.10.049

Cited by 44 publications

(23 citation statements)

References 19 publications

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“…Figure 11a also depicts that the higher the thickness of YAG:Ce shell, the higher is the maximum intensity in the PL spectrum. As can be seen, SiO 2 @YAG:Ce (1.0 at.% Ce) nanoparticles show the highest emission, compared to commercial and synthesized SiO 2 /YAG:Ce mixture composite, that is in agreement with similar works in this field [20][21][22][48][49][50][51]. The increased PL intensity of YAG:Ce in the core-shell state is believed to result from the inhibition of surface states in YAG:Ce nanoparticles and the higher light extraction at the SiO 2 /YAG:Ce interface.…”

Section: Photoluminescence (Pl) and Diffuse Transmission Spectra (Dtssupporting

confidence: 90%

Towards Multi-Functional SiO2@YAG:Ce Core–Shell Optical Nanoparticles for Solid State Lighting Applications

et al. 2020

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This paper aims to investigate the synthesis, structure, and optical properties of SiO2@YAG:Ce core–shell optical nanoparticles for solid state lighting applications. YAG:Ce phosphor is a key part in white light emitting diodes (LEDs), with its main functionality being the generation of yellow light. Generated yellow light from phosphor will be combined with blue light, emitted from chip, resulting in the generation of white light. Generated light in LEDs will often be scattered by SiO2 nanoparticles. SiO2 nanoparticles are often distributed within the optical window, aiming for a more homogeneous light output. The main idea in this research is to combine these functionalities in one core–shell particle, with its core being SiO2 and its shell being phosphor. In this study core–shell nanoparticles with different Ce3+ concentrations were synthesized by a sol–gel method. Synthesized nanoparticles were characterized by X-ray diffraction (XRD), small angle X-ray scattering (SAXS) analysis, high resolution transmission electron macroscopy (HRTEM), Fourier transform infrared (FTIR), and photoluminescence spectroscopy. Luminescence characteristics of SiO2@YAG:Ce core–shell particles were compared with that of SiO2/YAG:Ce mixture composite, which is now used in commercial LEDs. Obtained results showed that core–shell nanoparticles have comparatively much better optical properties, compared to SiO2/YAG:Ce mixture composite and can therefore be potentially used in LEDs.

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Section: Photoluminescence (Pl) and Diffuse Transmission Spectra (Dtssupporting

confidence: 90%

Towards Multi-Functional SiO2@YAG:Ce Core–Shell Optical Nanoparticles for Solid State Lighting Applications

et al. 2020

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“…With the development of high-power-white light-emitting diode (hp-WLED) and laser diode (LD) lighting, − remote phosphors, such as glass ceramics − or phosphors in glass, − films, − single crystals, − and TCs, − were proposed to overcome the degradation of luminous efficiency (LE) and lifetime of phosphors in resin or silicone induced by high temperature. ,,− The yellow-emitting YAG:Ce 3+ TC is promising due to its high thermal conductivity, high mechanical strength, and high luminous efficiency. ,,− However, its deficient red emissive component results in cool white light with a high correlated-color temperature (CCT > 6000 K) and a low color-rendering index (CRI < 70) when it is used in hp-WLED , or LD lighting. − The use of co-doped red-emitting ions, such as Pr 3+ , , Dy 3+ , Mn 2+ , or Cr 3+ , , is not an effective way to achieve warm white light due to their deficient and sharp red emissions. Modifying YAG by adding Gd ,,− or Mg–Si can increase red emissions in YAG:Ce 3+ .…”

Section: Introductionmentioning

confidence: 99%

Warm White Light with a High Color-Rendering Index from a Single Gd₃Al₄GaO₁₂:Ce³⁺ Transparent Ceramic for High-Power LEDs and LDs

Liu

Sun

Liu

et al. 2018

ACS Appl. Mater. Interfaces

140

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Transparent ceramics (TCs) are promising for high-power (hp) white light-emitting diode (WLED) and laser diode (LD) lighting. However, comfortable warm white light has not been achieved only using a single TC in hp-WLEDs/ LDs. Herein, highly transparent Gd 3 Al 4 GaO 12 :Ce 3+ (GAGG:Ce 3+ ) TCs (transmittance, T = 55.9−80.2%) were prepared via a solid-state reaction. Ce 3+ as a doped activator center in grains plays a positive role in luminescence based on the microstructural investigations by scanning electron microscopy and the cathodoluminescence system. T decreases upon increasing the Ce 3+ concentration and/or the ceramic thickness, whereas the luminous efficacy of hp-WLEDs/LDs goes up. For blue hp-LEDs driven at 350 mA or LDs of 2 W, warm white light with a low correlated-color temperature of ∼3000 K was achieved by a single GAGG:Ce 3+ TC, benefiting from its broad emission band (full width at half maximum, FWHM = 133−137 nm) and abundant red components (peaking at about 568−574 nm). The color-rendering index of hp-WLEDs reaches 78.9. These results are much better than the performance of the traditional Y 3 Al 5 O 12 :Ce 3+ (YAG:Ce 3+ ) TC, indicating that GAGG:Ce 3+ TCs are promising color converters for hp-WLEDs/LDs with a comfortable warm white light. KEYWORDS: Gd 3 Al 4 GaO 12 :Ce 3+ , transparent ceramic, high-power white LEDs, laser-driven lighting, warm white light

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“…It should be noted that the low thermal conductivity of glass matrix gives rise to the easy luminescence saturation for the PiG converter. At present, another type of PiG has been prepared by sintering a phosphor-glass film on a transparent or reflected substrate, such as glass, sapphire, aluminum, and ceramic substrates [31][32][33]. The PiG film still maintains the outstanding merits of PiG; meanwhile, it displays high luminescence saturation owing to the efficient heat conduction of thick film and the high thermal conductivity of substrate.…”

Section: Introduction mentioning

confidence: 99%

Unique sandwich design of high-efficiency heat-conducting phosphor-in-glass film for high-quality laser-driven white lighting

Peng

Yu²,

Zhao³

et al. 2022

J Adv Ceram

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Multi-color phosphor-in-glass (PiG) film has been considered as a promising color converter in high-quality laser lighting owing to its outstanding merits of phosphor versatility, tunable luminescence, and simple preparation. However, the opto-thermal properties of PiG film are severely affected by the photon reabsorption and backward scattering of phosphor structure and the heat conduction of substrate. Herein, a unique sandwich design of phosphor structure was introduced in the multi-color PiG film for high-quality laser lighting. By elaborately synthesizing the borosilicate glass with low glass transition temperature (Tg), similar expansion coefficient, and high refractive index (RI), the sandwiched PiGs were prepared by sintering (~600 °C) broadband green and red phosphor glass films on the double sides of sapphire. The green and red PiG films were tightly coated on the sapphire with no delamination and maintained higher luminescence intensity than raw phosphors at high temperatures. By simultaneously coupling photon reabsorption and backward scattering, the sandwiched green PiG film—sapphire—red PiG film (G—S—R PiG) yields a high-quality white light with a high luminous efficacy of 163 lm/W and an excellent color rendering index (CRI) of 85.4 under a laser power of 2.4 W, which are the best comprehensive results yet reported. Benefiting from the ingenious sandwich design with heat-conducting sapphire and thin PiG films, the G—S—R PiG displays low working temperatures (< 200 °C) under high-power laser excitation. This work reveals the role of sandwiched phosphor structure in photon loss and heat dissipation, which provides a new strategy to design PiG films for high-quality laser lighting.

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Design of laser-driven SiO2-YAG:Ce composite thick film: Facile synthesis, robust thermal performance, and application in solid-state laser lighting

Cited by 44 publications

References 19 publications

Towards Multi-Functional SiO2@YAG:Ce Core–Shell Optical Nanoparticles for Solid State Lighting Applications

Towards Multi-Functional SiO2@YAG:Ce Core–Shell Optical Nanoparticles for Solid State Lighting Applications

Warm White Light with a High Color-Rendering Index from a Single Gd₃Al₄GaO₁₂:Ce³⁺ Transparent Ceramic for High-Power LEDs and LDs

Unique sandwich design of high-efficiency heat-conducting phosphor-in-glass film for high-quality laser-driven white lighting

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Design of laser-driven SiO2-YAG:Ce composite thick film: Facile synthesis, robust thermal performance, and application in solid-state laser lighting

Cited by 44 publications

References 19 publications

Towards Multi-Functional SiO2@YAG:Ce Core–Shell Optical Nanoparticles for Solid State Lighting Applications

Towards Multi-Functional SiO2@YAG:Ce Core–Shell Optical Nanoparticles for Solid State Lighting Applications

Warm White Light with a High Color-Rendering Index from a Single Gd3Al4GaO12:Ce3+ Transparent Ceramic for High-Power LEDs and LDs

Unique sandwich design of high-efficiency heat-conducting phosphor-in-glass film for high-quality laser-driven white lighting

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Warm White Light with a High Color-Rendering Index from a Single Gd₃Al₄GaO₁₂:Ce³⁺ Transparent Ceramic for High-Power LEDs and LDs