High-performance Al2O3‒YAG:Ce composite ceramic phosphors for miniaturization of high-brightness white light-emitting diodes

Zhao, H. W.; Zhi, Li; Zhang, Mengwen; Li, Jinsheng; Wu, Meng-Ru; Li, Xiaodong; Chen, Jialin; Xie, Ming; Li, Junpeng; Sun, Xudong

doi:10.1016/j.ceramint.2019.09.017

Cited by 40 publications

(19 citation statements)

References 45 publications

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“…The applied sintering temperature was 1800 ℃ for all TCs, which was lower than the ideal sintering temperature of LuAG TC, resulting in the intergranular pores in ceramic bulks. Generally, for the real application of TC convertor for white LEDs/LDs, residual pores could act as light scattering centers to increase the light extraction rate [32][33][34][35]. The variation trend of grain size as a function of Cr 3+ doping concentration could be found in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Additionally, EDS mapping of the sintered Ce01Cr04 sample is shown in Fig. S2 in the ESM to investigate its elemental distribution, and it could be found that all the adopted elements (Lu, Al, O, Ce, and Cr) were distributed homogeneously inside ceramic bulk, indicating that both Ce 3+ and Cr 3+ ions were solid soluted into LuAG lattice without segregation [32][33][34][35].…”

Section: Resultsmentioning

confidence: 99%

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Efficient spectral regulation in Ce:Lu3(Al,Cr)5O12 and Ce:Lu3(Al,Cr)5O12/Ce:Y3Al5O12 transparent ceramics with high color rendering index for high-power white LEDs/LDs

et al. 2021

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Realizing a high color rendering index (CRI) in Ce:LuAG transparent ceramics (TCs) with desired thermal stability is essential to their applications in white LEDs/LDs as color converters. In this study, based on the scheme of configuring the red component by Cr3+ doping, an efficient spectral regulation was realized in Ce,Cr:LuAG TCs. A unilateral shift phenomenon could be observed in both photoluminescence (PL) and photoluminescence excitation (PLE) spectra of TCs. By constructing TC-based white LED/LD devices in a remote excitation mode, luminescence properties of Ce,Cr:LuAG TCs were systematically investigated. The CRI values of Ce:LuAG TC based white LEDs could be increased by a magnitude of 46.2%. Particularly, by combining the as fabricated Ce,Cr:LuAG TCs with a 0.5 at% Ce:YAG TC, surprising CRI values of 88 and 85.5 were obtained in TC based white LEDs and LDs, respectively. Therefore, Ce,Cr:LuAG TC is a highly promising color convertor for high-power white LEDs/LDs applied in general lighting and displaying.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Efficient spectral regulation in Ce:Lu3(Al,Cr)5O12 and Ce:Lu3(Al,Cr)5O12/Ce:Y3Al5O12 transparent ceramics with high color rendering index for high-power white LEDs/LDs

et al. 2021

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show abstract

“…Because the applied sintering temperature in this study was 1800 o C, which was lower than the ideal sintering temperature of LuAG TC, resulting in the intergranular pores in ceramic bulks. Generally, for the real application of TCs as color convertors for white LEDs/LDs, residual pores could act as light scattering centers to increase the light extraction rate [22,[31][32][33].…”

Section: Resultsmentioning

confidence: 99%

“…Additionally, EDS mapping of the sintered Ce01Cr04 sample is shown in Fig. S2 in the ESI † to investigate its elemental distribution, and it could be found that all the adopted elements (Lu, Al, O, Ce and Cr) were distributed homogeneously inside ceramic bulk, indicating that both Ce 3+ and Cr 3+ ions were solid soluted into LuAG lattice without segregation [22,[31][32][33].…”

Section: Resultsmentioning

confidence: 99%

Efficient Spectral Regulation in Ce:Lu3(Al,Cr)5O12 and Ce:Lu3(Al,Cr)5O12/Ce:Y3Al5O12 Transparent Ceramics With High Color Rendering Index for High-Power White LEDs/LDs

Zhou

Hou

Zhang

et al. 2021

Preprint

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Realizing a high color rendering index (CRI) in Ce:LuAG transparent ceramics (TCs) with desired thermal stability is essential to their applications in white LEDs/LDs as color converters. In this study, based on the scheme of configuring the red component by Cr3+ doping, an efficient spectral regulation was realized in Ce,Cr:LuAG TCs. A unilateral shift could be observed in both PL and PLE spectra. By constructing TC-based white LED/LD devices in a remote excitation mode, luminescence properties of Ce,Cr:LuAG TCs were systematically investigated. The CRI values of Ce:LuAG TC based white LEDs could be increased by a magnitude of 46.2%. Particularly, by combining Ce,Cr:LuAG TCs with a 0.5 at.% Ce:YAG TC, a surprising CRI values of 88 and 85.5 were obtained in TC based white LEDs and LDs, respectively. Therefore, Ce,Cr:LuAG TC is a highly promising color convertor for high-power white LEDs/LDs applied in general lighting and displaying.

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“…Such intragranular pores were mainly caused by the rapid grain growth velocity during the sintering process, and the doping of MnO 2 can hardly restrain the grain growth. These pores can increase the light scattering in the ceramic and as a result, more blue light can be absorbed instead of leaking from the ceramics and more red light can be extracted from the ceramics [20][21][22] . Hence, the proper ratio of the transmitted blue light and converted deep-red light can be achieved by a piece of thinner ceramic.…”

Section: Characterizationsmentioning

confidence: 99%

Deep-red emitting Mg2TiO4:Mn4+ phosphor ceramics for plant lighting

Wang

Lin

Zhang

et al. 2020

Preprint

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In this study, deep red emitting Mg2TiO4:Mn4+ phosphor ceramics were synthesized by the high temperature solid-state reaction method. The ceramics can be excited by the 465 nm blue light and had a narrow emission with a full width at half maximum (FWMH) value of 31 nm. The peak wavelength was located at 658 nm, which matched the demanded wavelength for photosynthesis. The crystal field strength (Dq) and the Racah parameters (B and C) were estimated by Tanabe-Sugano diagram. The thermal conductivity of the Mg2Ti(0.999)O4: 0.001Mn4+ ceramic was 7.535 W/(m·K) at room temperature, which was one order of magnitude higher than that of the traditional packaging method using the silicone gel. A set of phosphor converted LEDs were fabricated by mounting the phosphor ceramics onto the 460 nm blue LED chips and the CIE coordinates can move from the blue region to the purple light region with the thickness of the ceramic increasing. These results indicated that the Mg2TiO4:Mn4+ phosphor ceramic was suitable for plant lighting when combined with a blue LED chip.

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High-performance Al2O3‒YAG:Ce composite ceramic phosphors for miniaturization of high-brightness white light-emitting diodes

Cited by 40 publications

References 45 publications

Efficient spectral regulation in Ce:Lu3(Al,Cr)5O12 and Ce:Lu3(Al,Cr)5O12/Ce:Y3Al5O12 transparent ceramics with high color rendering index for high-power white LEDs/LDs

Efficient spectral regulation in Ce:Lu3(Al,Cr)5O12 and Ce:Lu3(Al,Cr)5O12/Ce:Y3Al5O12 transparent ceramics with high color rendering index for high-power white LEDs/LDs

Efficient Spectral Regulation in Ce:Lu3(Al,Cr)5O12 and Ce:Lu3(Al,Cr)5O12/Ce:Y3Al5O12 Transparent Ceramics With High Color Rendering Index for High-Power White LEDs/LDs

Deep-red emitting Mg2TiO4:Mn4+ phosphor ceramics for plant lighting

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