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Tailoring thermal behavior and luminous performance in LuAG:Ce films via thickness control for high-power laser lighting applications

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Rare Metals 2024年第12期43卷 6537-6548页

作者： Shao-Hong Liu Bing-Guo Xue Li-Min Zhou Hao Cui Man-Men Liu Li Chen Ming Wen Hai-Gang Dong Feng Liu Wei Wang Song Li Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education) School of Materials Science and EngineeringNortheastern University State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals Yunnan Precious Metals Laboratory Co.Ltd Sino-Platinum Metals Semiconductor Materials (Yunnan) Co Ltd

Lutetium aluminum garnet doped with cerium（LuAG:Ce） thin films have been identified as a promising material for high-power laser-driven lighting *** this study,spray pyrolysis we employed to fabricate LuAG:Ce films on sapphire substrates and the impact of film thickness on thermal management and light emission efficiency was *** results show that,regardless of thickness,LuAGiCe films exhibit impressive internal quantum efficiencies（IQE） exceeding 83.2% and external quantum efficiencies（EQE） surpassing 56.4%,with minimal alteration of luminescent ***,thinner films facilitate more efficient heat dissipation to the underlying sapphire substrate,resulting in superior thermal management and outstanding luminous performance under high-power laser ***,the thinnest LuAG:Ce film（15.79 μm） exhibited rapid thermal stabilization（～130℃ within 30 s） and maintained stability during continuous irradiation lasting 30 min,with a corresponding decrease in luminous flux to 87.9% of its initial value within the first 60 *** film also demonstrated relatively high and stable conversion efficiency and luminous efficiency,achieving higher saturation thresholds(15 W·mm-2) and luminous flux（1070 lm）.In contrast,thicker films exhibited a shift in the saturation point toward lower power *** findings provide valuable insights for the practical implementation of LuAG:Ce films in advanced lighting technologies.

关键词： Heat dissipation laser lighting LuAG:Ce Luminescence saturation Phosphor converter

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Cyan-green-emitting Ca_(3)Sc_(2)Si_(3)O_(12):Ce^(3+)transparent ceramics:A promising color converter for high-brightness laser lighting

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Journal of Advanced Ceramics 2023年第9期12卷 1731-1741页

作者： Huajun Wu Hao Wu Guo-Hui Pan Liangliang Zhang Zhendong Hao Jiahua Zhang State Key Laboratory of Luminescence and Applications Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Transparent phosphor ceramics have received increasing attention for high-brightness laser lighting,but commercially available phosphor ceramics are currently mainly limited to yellow YAG:Ce and green LuAG:Ce garnets,leaving a“cyan cavity”which is an obstacle to realizing full-color *** new phosphor ceramics capable of filling the cavity is a ***,for the first time,cyan-green-emitting Ca_(3)Sc_(2)Si_(3)O_(12):Ce^(3+)(CSS:Ce)transparent ceramics have been successfully developed by two-step sintering technique under *** as-prepared CSS:Ce ceramics present high relative density of 99.7%and optical transmittance of 71%in the cyan-green spectral *** exhibits an efficient band emission peaking at 504 nm(under 450 nm excitation)with internal/external quantum efficiency of 91%/62%.Furthermore,it has excellent thermal stability with a thermal quenching temperature(T_(0.5))of 838 K,approximately 100 K higher than that of LuAG:Ce ceramics(738 K).In addition,the CSS:Ce ceramics can withstand blue laser density of 45.6 W/mm^(2)and meanwhile generates cyan-green light with a forward luminous flux of 813 lm and forward luminous efficacy of 162 lm/*** CSS:Ce transparent ceramics exhibit excellent luminescence performance comparable to the commercial LuAG:Ce ceramics and could be a highly promising color converter for high-brightness laser lighting.

关键词： transparent ceramics color converter laser lighting garnet Ca_(3)Sc_(2)Si_(3)O_(12)(CSS)

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Three Birds with One Stone:K2SiF6:Mn4+ Single Crystal Phosphors for the High-Power and laser-Driven lighting

Three Birds with One Stone:K2SiF6:Mn4+ Single Crystal Phosph...

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中国稀土学会2020学术年会暨江西(赣州)稀土资源绿色开发与高效利用大会

作者： Yayun Zhou Changkai Yu Enhai Song Yuanjing Wang Hong Ming Zhiguo Xia Qinyuan Zhang State Key Laboratory of Luminescent Materials and Devices and Guangdong Provincial Key Laboratory of Fiber laser Materials and Applied Techniques South China University of Technology Department of Physics Fudan University

Narrow-band red-emitting fluoride phosphors play crucial roles in lighting and backlight displays, whereas the stability issue is a major challenge. Here, highly stable K2 SiF6:Mn4+(KSFM) single crystal phosphors with tunable sizes(20 ～ 1000 μm) have been grown by a facile saturated crystallization method. The small specific surface area together with the unique Mn4+-rare interface layer in KSFM single crystals enables the simultaneous fulfillment of the high external quantum efficiency, excellent moisture, improved thermal quenching and dissipation for the high-power and laser-driven lighting applications. As a prototype, a warm white laser diode device with a high luminous flux of 202.7 lm and CCT of 3277 K, as well as a Ra of 87.9 has been presented. This work provides new insights into the development of highly efficient and stable materials for advanced lighting applications.

关键词： Single crystal phosphor Red emission High-power White LEDs laser lighting

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Tutorial on laser-based visible light communications[Invited]

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Chinese Optics Letters 2024年第9期22卷 126-136页

作者： Yuqi Hou Yue Wang Zengxin Li Meixin Liu Shulan Yi Xiaoqian Wang Liang Xia Guangyi Liu Jianyang Shi Ziwei Li Junwen Zhang Nan Chi Tien Khee Ng Boon S.Ooi Chao Shen Key Laboratory for Information Science of Electromagnetic Waves Ministry of EducationSchool of Information Science and TechnologyFudan UniversityShanghai 200433China ZGC Institute of Ubiquitous-X Innovation and Applications Beijing 100876China Photonics Laboratory Electrical and Computer EngineeringDivision of ComputerElectrical and Mathematical Sciences and EngineeringKing Abdullah University of Science and TechnologyThuwal 23955-6900Saudi Arabia China Mobile Research Institute Beijing 100876China

Facing escalating demands for high-speed,large-bandwidth,and low-latency wireless data links,laser communication technology has emerged as a promising *** free-space optical communication conventionally utilizes nearinfrared light sources,there has been growing interest in exploring new spectral resources,including visible ***,laser-based white light has been demonstrated in visible light communication(VLC),with a unique capability to seamlessly integrate with illumination and display *** review summarizes the key devices and system technologies in semiconductor-laser-based white light for VLC-related *** recent advances and many emerging applications in the evolution of lighting,display,and communication are discussed.

关键词： visible light communication LiFi laser lighting GaN laser semiconductor laser

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