Journal
APPLIED MATERIALS TODAY
Volume 27, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apmt.2022.101439
Keywords
Co-substitution; Garnet compounds; Full-spectrum lighting; Color rendering index; Quantum efficiency
Categories
Funding
- National Natural Science Foundation of China [51502190]
- Natural Science Foundation of Shanxi Province [20210302123153]
- Young Sanjin Scholars Dis-tinguished Professor Program of Shanxi Province [2020-skllmd-01]
- Open Fund of the State Key Laboratory of Luminescent Materials and Devices (South China University of Technology) [LE210100100]
- Australian Research Council
- Australian Research Council [LE210100100] Funding Source: Australian Research Council
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This study developed a novel green-emitting CaY2HfAl4O12:2%Ce3+ garnet-type phosphor through the co-substitution of Ca2 +-Hf4+ ion-pairs into a Y3Al5O12:Ce3+ phosphor, which exhibited high efficiency and excellent thermal stability under blue light excitation. Incorporating this green phosphor into LED devices enabled full-spectrum lighting with high CRI and low color temperature characteristics.
Developing blue-light-excited high-efficiency phosphor remains challenging for the fabrication of warm white light-emitting diodes (LEDs) with an ultra-high color rending index (CRI). Here, the co-substitution of Ca2 +-Hf4+ ion-pairs into a Y3Al5O12:Ce3+ phosphor, affords a novel, broadband, green-emitting CaY2HfAl4O12:2%Ce3+ garnet-type phosphor amenable to efficient blue light excitation. The structure, luminescent properties and blue-shift of this new material relative to a Y3Al5O12:2%Ce3+ phosphor have been extensively studied. Under 450 nm excitation, the optimum material exhibits high internal quantum efficiency (73.3%) and excellent thermal stability. Incorporation of the CaY2HfAl4O12:2%Ce3+ green phosphor into a prototype LED device delivers full-spectrum lighting with a high CRI (Ra = 97.2, R9 = 98.3) and low correlated color temperature (CCT = 3508 K). The resulting insight should aid the development of novel high-efficiency phosphors for full-spectrum warm-white LEDs with high-CRI value.(c) 2022 Elsevier Ltd. All rights reserved.
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