Transparent Ce:GdYAG ceramic color converters for high-brightness white LEDs and LDs

Liu, Xin; Zhou, Heyu; Hu, Zhijuan; Chen, Xiaopu; Shi, Yun; Zou, Jun; Li, Jiang

doi:10.1016/j.optmat.2018.11.031

Cited by 58 publications

(31 citation statements)

References 18 publications

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“…A similar phenomenon was observed for reported (Y,Gd)AG:Ce ceramics, in which intragranular pores were observed in the heavily Gd-doped samples. 16,18,39,62 The PL and PLE spectra of the as-prepared ceramics are depicted in Fig. 4.…”

Section: Optical Propertiesmentioning

confidence: 99%

“…Compared with PiG and SCs, Ce:YAG TCs are developing rapidly due to their low cost, ease of achieving high doping concentration, short production cycles, high thermal conductivity (about 14 W m À1 K À1 ) and high mechanical strength. [14][15][16][17][18] However, limited by the proportion mismatch of their emitted light, Ce:YAG TCs can hardly meet the requirement of a high color rendering index (CRI). This restricts the application of this brand-new solid-state lighting technology with TCs as the color converter.…”

Section: Introductionmentioning

confidence: 99%

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High recorded color rendering index in single Ce,(Pr,Mn):YAG transparent ceramics for high-power white LEDs/LDs

Zhang

Zhou

et al. 2020

J. Mater. Chem. C

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Section: Optical Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High recorded color rendering index in single Ce,(Pr,Mn):YAG transparent ceramics for high-power white LEDs/LDs

Zhang

Zhou

et al. 2020

J. Mater. Chem. C

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“…or partial substitute of Y 3+ by different ions (Gd 3+ , etc.) in YAG:Ce to add red spectral components in its spectrum, but usually with a sacrifice in luminous efficacy [15][16][17][18][19]. Alternatively, composite phosphor ceramics consisting of both red-and yellow-emitting phosphors are expected to realize high color rendering lighting.…”

Section: Introduction mentioning

confidence: 99%

Composition and structure design of three-layered composite phosphors for high color rendering chip-on-board light-emitting diode devices

et al. 2021

Self Cite

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A three-layered phosphor structure was designed and prepared by the spin coating of BaSi2N2O2:Eu (cyan-emitting) and (Sr,Ca)AlSiN3:Eu (red-emitting) phosphor films on the yellow-emitting Y3Al5O12:Ce (YAG:Ce) phosphor ceramic synthesized by the solid-state reaction under vacuum sintering. In order to achieve high color rendering lighting, the influence of the composition and structure of the three-layered phosphors on the optical, thermal, and electrical properties of the chip-on-board (COB) packaged white-light-emitting diodes (WLEDs) was studied systematically. The WLED with the structure of “red+cyan+yellow” (R+C+Y) three-layered phosphor generated neutral white light and had a luminous efficacy of 75 lm/W, the fidelity index (Rf) of 93, the gamut index (Rg) of 97, and the correlated color temperature (CCT) of 3852 K. Under the excitation of laser diode (LD), the layer-structured phosphor yielded the white light with a luminous efficacy of 120 lm/W, color rendering index (CRI) of 90, and CCT of 5988 K. The result indicates that the three-layered phosphor structure is a promising candidate to achieve high color rendering and high luminous efficacy lighting.

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“…White light emitting diodes (LEDs) and laser diodes (LDs) have considerable applications in general lighting, medical treatment and plant growth, etc., thanks to their advantages such as energy saving, environmentally friendly and high e ciency [1][2][3]. White LEDs/LDs are assembled by yellow conversion materials combining blue excitation sources, and the applied color conversion materials include phosphor powder, phosphor in glass, single crystal and transparent ceramic (TC) [4][5][6].…”

Section: Introductionmentioning

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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Transparent Ce:GdYAG ceramic color converters for high-brightness white LEDs and LDs

Cited by 58 publications

References 18 publications

High recorded color rendering index in single Ce,(Pr,Mn):YAG transparent ceramics for high-power white LEDs/LDs

High recorded color rendering index in single Ce,(Pr,Mn):YAG transparent ceramics for high-power white LEDs/LDs

Composition and structure design of three-layered composite phosphors for high color rendering chip-on-board light-emitting diode devices

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

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