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Efficient and Thermally Robust Broadband Near-Infrared Emission in a Garnet Ca3MgHfGe3O12:Cr3+ Phosphor
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2022-12-03 , DOI: 10.1002/adom.202202323 Chaojie Li 1 , Jiyou Zhong 1
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2022-12-03 , DOI: 10.1002/adom.202202323 Chaojie Li 1 , Jiyou Zhong 1
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Near-infrared (NIR) spectroscopy based on phosphor-converted light-emitting-diode (pc-LED) has promising applications in food quality analysis, security monitoring, medical diagnosis, and bioimaging fields, stimulating the demand of developing NIR phosphors with high-performance. Herein, a highly efficient and thermally robust Ca3MgHfGe3O12:Cr3+ NIR phosphor is discovered, which exhibits a broadband NIR emission (λem = 800 nm) covering 700 to 1100 nm region with an internal quantum efficiency as high as 90.7% when excited by 460 nm blue light. Moreover, the emission intensity at 423 K retains 84.5% of that at room temperature. The highly efficient and thermally robust luminescence of this material is mainly ascribed to the ultrawide bandgap of host, extremely weak electron–photon coupling effect, defect-free, and highly structural rigidity. The NIR pc-LED device fabricated by using the optimized Ca3Mg0.97Hf0.97Ge3O12:0.06Cr3+ phosphor combined with blue (λem = 455 nm) LED chip produces an excellent NIR output power of 49.5 mW @ 11.5% under a driving current of 150 mA, which indicates a superiority to the device fabricated by using the well-known efficient ScBO3:Cr3+ phosphor under the same condition. Therefore, this work not only provides a promising broadband NIR material, but also highlights the design rules for searching high-performance NIR materials toward spectroscopy applications.
中文翻译：
石榴石 Ca3MgHfGe3O12:Cr3+ 荧光粉中高效且耐热的宽带近红外发射
基于荧光粉转换发光二极管 (pc-LED) 的近红外 (NIR) 光谱在食品质量分析、安全监控、医学诊断和生物成像领域具有广阔的应用前景，刺激了开发高光谱 NIR 荧光粉的需求表现。在此，发现了一种高效且耐热的 Ca 3 MgHfGe 3 O 12 :Cr 3+ NIR 荧光粉，它表现出宽带 NIR 发射（λ em = 800 nm) 覆盖 700 至 1100 nm 区域，当被 460 nm 蓝光激发时，内部量子效率高达 90.7%。此外，423 K 时的发射强度保持室温下的 84.5%。这种材料的高效和耐热发光主要归因于主体的超宽带隙、极弱的电子-光子耦合效应、无缺陷和高结构刚性。使用优化后的Ca 3 Mg 0.97 Hf 0.97 Ge 3 O 12 :0.06Cr 3+荧光粉与蓝色(λ em = 455 nm) LED 芯片在 150 mA 的驱动电流下产生 49.5 mW @ 11.5% 的出色 NIR 输出功率，这表明其优于使用众所周知的高效 ScBO 3 :Cr 3+荧光粉在相同的条件。因此，这项工作不仅提供了一种有前途的宽带 NIR 材料，而且突出了寻找高性能 NIR 材料以用于光谱应用的设计规则。
更新日期：2022-12-03
中文翻译：
石榴石 Ca3MgHfGe3O12:Cr3+ 荧光粉中高效且耐热的宽带近红外发射
基于荧光粉转换发光二极管 (pc-LED) 的近红外 (NIR) 光谱在食品质量分析、安全监控、医学诊断和生物成像领域具有广阔的应用前景，刺激了开发高光谱 NIR 荧光粉的需求表现。在此，发现了一种高效且耐热的 Ca 3 MgHfGe 3 O 12 :Cr 3+ NIR 荧光粉，它表现出宽带 NIR 发射（λ em = 800 nm) 覆盖 700 至 1100 nm 区域，当被 460 nm 蓝光激发时，内部量子效率高达 90.7%。此外，423 K 时的发射强度保持室温下的 84.5%。这种材料的高效和耐热发光主要归因于主体的超宽带隙、极弱的电子-光子耦合效应、无缺陷和高结构刚性。使用优化后的Ca 3 Mg 0.97 Hf 0.97 Ge 3 O 12 :0.06Cr 3+荧光粉与蓝色(λ em = 455 nm) LED 芯片在 150 mA 的驱动电流下产生 49.5 mW @ 11.5% 的出色 NIR 输出功率，这表明其优于使用众所周知的高效 ScBO 3 :Cr 3+荧光粉在相同的条件。因此，这项工作不仅提供了一种有前途的宽带 NIR 材料，而且突出了寻找高性能 NIR 材料以用于光谱应用的设计规则。
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