Abstract:Al2O3–YAG:Ce phosphor ceramic shows excellent luminescence, thermal performance, and thus great suitability for use in solid-state laser lighting.
“…YAG-based ceramics can accept a variety of active doping agents such as Ce 3+ and Nd 3+ for fluorescence LED or solid laser host material applications 1,4,5,37 . Luminescence properties were measured on a Ce 3+ -doped YAG-Al 2 O 3 composite ceramic (AY26 glass crystallized for 2 h at 1100 °C).…”
Section: Resultsmentioning
confidence: 99%
“…When doped by Ce 3+ , the YAG-Al 2 O 3 nanoceramic synthesized at 1100 °C shows a 87.5% quantum efficiency, which is comparable with commercial YAG:Ce 3+ fluorescent powders (75–90%) 35,36 . The combination of the high-performance mechanical and optical properties with the thermal stability of this YAG-Al 2 O 3 ceramic material, coupled to its facile room pressure preparation, opens great potential applications in wide optical fields such as jewellery, lenses, scintillators and phosphor converters for high-power white-light LED, and laser diodes, which require limited light scattering in the materials 37 .Fig. 1Transparent YAG-Al 2 O 3 composite nanoceramics.…”
Transparent crystalline yttrium aluminum garnet (YAG; Y3Al5O12) is a dominant host material used in phosphors, scintillators, and solid state lasers. However, YAG single crystals and transparent ceramics face several technological limitations including complex, time-consuming, and costly synthetic approaches. Here we report facile elaboration of transparent YAG-based ceramics by pressureless nano-crystallization of Y2O3–Al2O3 bulk glasses. The resulting ceramics present a nanostructuration composed of YAG nanocrystals (77 wt%) separated by small Al2O3 crystalline domains (23 wt%). The hardness of these YAG-Al2O3 nanoceramics is 10% higher than that of YAG single crystals. When doped by Ce3+, the YAG-Al2O3 ceramics show a 87.5% quantum efficiency. The combination of these mechanical and optical properties, coupled with their simple, economical, and innovative preparation method, could drive the development of technologically relevant materials with potential applications in wide optical fields such as scintillators, lenses, gem stones, and phosphor converters in high-power white-light LED and laser diode.
“…YAG-based ceramics can accept a variety of active doping agents such as Ce 3+ and Nd 3+ for fluorescence LED or solid laser host material applications 1,4,5,37 . Luminescence properties were measured on a Ce 3+ -doped YAG-Al 2 O 3 composite ceramic (AY26 glass crystallized for 2 h at 1100 °C).…”
Section: Resultsmentioning
confidence: 99%
“…When doped by Ce 3+ , the YAG-Al 2 O 3 nanoceramic synthesized at 1100 °C shows a 87.5% quantum efficiency, which is comparable with commercial YAG:Ce 3+ fluorescent powders (75–90%) 35,36 . The combination of the high-performance mechanical and optical properties with the thermal stability of this YAG-Al 2 O 3 ceramic material, coupled to its facile room pressure preparation, opens great potential applications in wide optical fields such as jewellery, lenses, scintillators and phosphor converters for high-power white-light LED, and laser diodes, which require limited light scattering in the materials 37 .Fig. 1Transparent YAG-Al 2 O 3 composite nanoceramics.…”
Transparent crystalline yttrium aluminum garnet (YAG; Y3Al5O12) is a dominant host material used in phosphors, scintillators, and solid state lasers. However, YAG single crystals and transparent ceramics face several technological limitations including complex, time-consuming, and costly synthetic approaches. Here we report facile elaboration of transparent YAG-based ceramics by pressureless nano-crystallization of Y2O3–Al2O3 bulk glasses. The resulting ceramics present a nanostructuration composed of YAG nanocrystals (77 wt%) separated by small Al2O3 crystalline domains (23 wt%). The hardness of these YAG-Al2O3 nanoceramics is 10% higher than that of YAG single crystals. When doped by Ce3+, the YAG-Al2O3 ceramics show a 87.5% quantum efficiency. The combination of these mechanical and optical properties, coupled with their simple, economical, and innovative preparation method, could drive the development of technologically relevant materials with potential applications in wide optical fields such as scintillators, lenses, gem stones, and phosphor converters in high-power white-light LED and laser diode.
“…Li et al. developed a composite Al 2 O 3 ‐YAG:Ce ceramic as a robust yellow‐emitting converter, which gives a high luminous flux of 2000 lm when pumped by a 45 W blue LD . Li et al.…”
Color converter is a key luminescent material in the laser‐driven solid state lighting, which must bear high‐density excitation and serious thermal attack from the incident laser. Here, a thermally robust yellow‐emitting La3Si6N11:Ce‐in‐glass (LSN:Ce‐PiG) film for laser lighting is reported by co‐firing the LSN:Ce and glass powders on a thermally conductive sapphire substrate. No detectable interfacial reaction occurs between the LSN:Ce particle and glass matrix, enabling the film to fully inherit the original thermal robustness and high quantum efficiency. The optical performance of LSN:Ce‐PiG‐converted white laser light has been effectively optimized by changing the phosphor‐to‐glass (PtG) ratio and the film thickness. The highest light conversion efficiency is respectively achieved at PtG = 2:3 and the thickness of 70 µm, and the saturation threshold is found to decrease with either a higher PtG ratio or a thicker film. The optimized LSN:Ce‐PiG film (P2G3‐50) can withstand a maximum laser power density of 12.91 W mm−2 and produce a cool white light with a high luminous flux of 1076 lm (luminance of 773 Mcd m−2), a luminous efficiency of 166.05 lm W−1, a color rendering index of 70. These results make the LSN:Ce‐PiG film a considerably promising color converter for laser lighting.
“…Among which, yttrium aluminum garnet (YAG) transparent ceramic is an ideal matrix for WLEDs applications, due to its excellent mechanical, heat‐resistance, and chemical properties . Since the first WLEDs packaged with YAG: Ce transparent ceramic was performed in 2008, the rare‐earth doped YAG transparent ceramics have been investigated as phosphor converters in recent years, due to their high level quantum efficiency and long operational lifetime . Unfortunately, most of the research on YAG transparent ceramic phosphors are used in blue InGaN LEDs chips, there are few studies on the application to UV‐LEDs chips.…”
A kind of Dy‐doped yttrium aluminum garnet (YAG) transparent ceramic for ultraviolet excited single‐phase white light‐emitting phosphor was investigated, which has high‐quantum efficiency (45%). The temperature field of Dy:YAG transparent ceramic was calculated by steady‐state thermal simulation. Moreover, by combining with 365 nm light‐emitting diodes (LED) chip directly, the Commission Internationale de l’Éclairage coordinate (x = 0.33, y = 0.35) is close to the standard equal energy white light illumination. The Dy:YAG transparent ceramic, possessing of good optical and thermal properties, is promising for applications in high‐power LEDs devices.
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