Photothermal synergistic AlN-YAG:Ce composite phosphor ceramics for laser-driven lighting applications
Peer-Reviewed Publication
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The advancement of kilowatt-level laser lighting is hindered by poor thermal stability of YAG:Ce phosphors. AlN was introduced into YAG:Ce to fabricate AlN-YAG:Ce composite ceramics via powder-embedding nitrogen atmosphere sintering. The ceramic with 50 vol.% AlN achieves a thermal conductivity of 27.2 W·m-1·K-1—three times higher than pure YAG:Ce—while maintaining comparable luminescence. Under 1.3 W·mm-2 blue laser excitation, the 10 vol.% AlN-YAG:Ce ceramic delivers a luminous efficacy of 200.1 lm·W-1 and 4608 K. A 10 W blue laser prototype illuminates over 500 m, demonstrating strong potential for high-power laser-driven lighting.
Proton affinity or transfer is crucial in determining the activity and selectivity of the electroreduction of CO2. However, optimizing proton supply during CO2 reduction while simultaneously enhancing the activity of catalytic sites and inhibiting hydrogen evolution poses a significant challenge. It has been found that introduce another active site around the CO2 reduction catalytic site to supply proton for the proton process has been proved been an effective strategy to modulate the leverage relationship in electrochemical CO2 reduction (ECR).
Eu2+-doped glass has received considerable attention due to its dual functionality in both X-ray imaging and white LEDs. However, the amorphous nature of glass limits its luminescence efficiency. In this work, four strategies, including selecting oxyfluoride glass as host, regulating optical basicity, introducing appropriate heavy elements, and adding carbon powders as reducing agent, were proposed to improve X-ray excited luminescent and photoluminescent performance. All results consistently demonstrate the dual functionality of Eu2+-doped glass and establish a novel paradigm for improving luminescent efficiency of glass materials.
Catalytic CO₂ utilization (CCU) offers a pathway to turn power plant emissions into valuable fuels and chemicals, but deploying these complex technologies has been hindered by safety and economic hurdles. A new review led by Xiansheng Li from China Datang Technology Innovation Co., Ltd. provides a pragmatic, three-tiered engineering framework to help utilities, investors, and policymakers navigate this challenge, offering a clear path from scientific concept to bankable project.
Conventional ceramic sintering is energy-intensive and often leads to uncontrolled grain growth. A new class of field-assisted sintering technologies—including hot oscillatory pressing, cold sintering, and ultrafast high-temperature sintering—is overcoming these limitations. By synergistically coupling temperature, mechanical, and electric fields, these methods achieve >99% relative density while preserving ultrafine microstructures. With energy savings up to 80% and compatibility with temperature-sensitive materials, these innovations are paving the way for next-generation high-performance ceramics and composites in 5G, solid-state batteries, and extreme environment applications.