Investigation of an LuAG:Ce translucent ceramic synthesized via spark plasma sintering: Towards a facile synthetic route, robust thermal performance, and high-power solid state laser lighting

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

doi:10.1016/j.jeurceramsoc.2017.07.036

Cited by 84 publications

(41 citation statements)

References 19 publications

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“…This phenomenon was reported by Xie et al and noticed in the β-SiAlON:Eu based phosphor-in-glass (PiG) whose luminescence intensity exhibited an apparent decline tendency when the incident laser power density (LPD) reached 1 W/mm 2 [35]. Aiming to improve the phosphors' saturation threshold an extensive research has been performed recently [15,21,36]. Zheng et al reported a PiG film that could survive under the 11.2 W/mm 2 blue laser excitation [37].…”

Section: Introductionmentioning

confidence: 60%

“…Furthermore, many of the reported characterization methods are not equipped with an integrating sphere, so they cannot measure the absolute luminous flux, color rendering index (CRI) and correlated color temperature (CCT) accurately, because these methods cannot fully collect the optical signals, as well as the apparent surface reflection preference of an incident laser. Thirdly, a few studies adopted the transmission mode to measure the saturation of phosphors, whereas the reflection losses were neglected which inevitably caused the errors in measurement of the luminescence and colorimetric properties [36,[42][43][44]. Thus, a new characterization method that is able to fully collect and analyze the optical signal from the LD and phosphors are is in great demand.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of laser-induced luminescence saturation in a single-crystal YAG:Ce phosphor: Towards unique architecture, high saturation threshold, and high-brightness laser-driven white lighting

Thorseth

Xu³

et al. 2019

Journal of Luminescence

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A significant obstacle in the development of phosphor-converted white-laser diodes (pc-wLDs) is associated with the laser-induced luminescence saturation of phosphors. YAG:Ce is a canonical yellow-emitting phosphor. However, there has been no few systematic research of measurement and understanding of the luminescence saturation in YAG:Ce yet. Here, we analyze the luminescence saturation of a single-crystal YAG:Ce with a unique phosphor geometry. A novel characterization method, which enables the optical signals to be fully collected and analyzed, is introduced. The effects of both laser power and laser power density on the luminescence properties and colorimetric properties of the YAG:Ce are studied systematically. The results show that a single-crystal YAG:Ce has a high saturation threshold (over 360 W/mm 2 ) so that only a very slight saturation behavior can be observed at a high power density. Furthermore, a pc-wLDs light source based on the combination of a single laser diode and a YAG:Ce phosphor exhibits remarkable efficiency and stability. Under the excitation of a 3.38 W blue laser (~100 W/mm 2 ), the white light emission with the luminous flux of 465 lm, the luminous 2 / 23 efficacy (LE) of 145 lm/W, and the correlated color temperature (CCT) of 4980 K can be achieved.

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Section: Introductionmentioning

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Investigation of laser-induced luminescence saturation in a single-crystal YAG:Ce phosphor: Towards unique architecture, high saturation threshold, and high-brightness laser-driven white lighting

Thorseth

Xu³

et al. 2019

Journal of Luminescence

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“…Phosphor ceramics are thought to be the favorable choices to replace phosphor-in-silicon color converters [ 14 , 15 ]. LuAG:Ce ceramics not only have a broad emission band between 500 nm and 700 nm, but also possess excellent thermal stability and high luminous efficiency, which are regarded as the most promising color converters for high-power LEDs [ 16 , 17 , 18 , 19 , 20 ]. Xu et al synthesized LuAG:Ce translucent ceramics (TC) by spark plasma sintering technique [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

“…LuAG:Ce ceramics not only have a broad emission band between 500 nm and 700 nm, but also possess excellent thermal stability and high luminous efficiency, which are regarded as the most promising color converters for high-power LEDs [ 16 , 17 , 18 , 19 , 20 ]. Xu et al synthesized LuAG:Ce translucent ceramics (TC) by spark plasma sintering technique [ 20 ]. The obtained LuAG:Ce ceramics have wonderful thermal conductivity (6.3 W m −1 K −1 ) and high reliability (1.9% decrease after 1000 h at 85 °C and 85% humidity) [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic Spray Pyrolysis Synthesis and Photoluminescence of LuAG:Ce Thin Films

et al. 2022

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LuAG:Ce (Lu3Al5O12:Ce) is one of the most important color converters in white lighting industry. Especially, LuAG:Ce film attracts more attention due to the outstanding advantages, such as the efficient heat dissipation, the saving of rare earth, and so on. Here, LuAG:Ce film on sapphire was successfully prepared by the ultrasonic spray pyrolysis process. The phase, microstructure and photoluminescence of LuAG:Ce films were investigated. LuAG:Ce films had a thickness of around 5 μm, which were well crystallized at 1000 °C in air atmosphere to form the typical garnet structure. Under the protection of CO atmosphere, increasing the annealing temperature greatly enhanced the photoluminescence performance. After annealing at 1500 °C for 5 h in CO atmosphere, 3.0 mol.% Ce3+ doped LuAG:Ce film exhibited the highest emission and excitation intensity. The emission intensity of 3.0 mol.% Ce3+ doped LuAG:Ce film annealed at 1500 °C in CO atmosphere increased up to five times, when compared with the best LuAG:Ce film annealed at 1000 °C in air atmosphere. The effects of Ce3+ doping concentration on the photoluminescence were also examined. As the Ce3+ doping concentration increased from 0.2 mol.% to 7.0 mol.%, the color of LuAG:Ce films changed from yellowish green to greenish yellow. When coupling the 3.0 mol.% Ce3+ doped LuAG:Ce film with a 0.5 W 450 nm blue laser, the formed device successfully emitted white light.

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“…These materials are not well suited for laser illumination due to low thermal conductivity and these phosphors typically carbonize when used with lasers. More durable materials like single crystals, ceramic material and phosphor in glass show great promise as materials capable of handling high laser power [5][6][7][8][9]. One of the main limitations is saturation of the luminescence from the phosphor.…”

Section: Introductionmentioning

confidence: 99%

Limitations to emission spot size in laser lighting

Jensen

Krasnoshchoka

Hansen³

et al. 2020

Light-Emitting Devices, Materials, and Applications XXIV

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Laser lighting is an emerging technology to generate high luminance lighting. To achieve high luminance or high luminous exitance, the light emitter must have high flux and small size simultaneously. When laser light is focused to a small spot size on the phosphor material, the two main limitations are saturation of the phosphor material and the spot size of the generated light. Here, we investigate experimentally and numerically the spot size of laser lighting dependent on the spot size of the incident laser light and the material properties of the wavelength converting phosphor material. We find numerically that the spot size of the generated white light is significantly influenced by the phosphor properties. The spot size of the white light determines the étendue and thereby the possibility to collect and shape the light. This has important implications in applications of laser lighting.

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Investigation of an LuAG:Ce translucent ceramic synthesized via spark plasma sintering: Towards a facile synthetic route, robust thermal performance, and high-power solid state laser lighting

Cited by 84 publications

References 19 publications

Investigation of laser-induced luminescence saturation in a single-crystal YAG:Ce phosphor: Towards unique architecture, high saturation threshold, and high-brightness laser-driven white lighting

Investigation of laser-induced luminescence saturation in a single-crystal YAG:Ce phosphor: Towards unique architecture, high saturation threshold, and high-brightness laser-driven white lighting

Ultrasonic Spray Pyrolysis Synthesis and Photoluminescence of LuAG:Ce Thin Films

Limitations to emission spot size in laser lighting

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