Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 6, Issue 18, Pages 4967-4976Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8tc01216d
Keywords
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Funding
- National Key RAMP
- D Program of China [2016YFB0701003, 2016YFB0400605, 2017YFB0403104]
- National Natural Science Foundation of China [51772286, 51402284, 11604330]
- Natural Science Foundation of Jilin province [20150520022JH, 20160520171JH]
- prior sci-tech program of innovation and entrepreneurship of oversea Chinese talent of Jilin province
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The garnet Ca2LuZr2Al3O12 (CLZA) is a promising broad-band NIR phosphor for blue LED chips when it is doped with Cr3+. The photoelectric efficiency of the pc-LED fabricated from CLZA:Cr3+ and a 460 nm LED chip, in the 750-820 nm spectral range, was 4.1%, which was superior to the efficiency of a tungsten lamp (2.9%). In CLZA's structure, Cr3+ occupied Ca2+/Lu3+ and Zr4+ sites and showed two luminescence centers. The crystal strength parameters of Ce3+ and Cr3+ were calculated to show the coordination environment of the dodecahedral and octahedral sites in CLZA. Low absorbance of Cr3+ was the main constraint on quantum efficiency. Ce3+ was thus introduced as a sensitizer to improve the absorbance. An efficient energy transfer process can be observed between Ce3+ and Cr3+ in CLZA. The temperature dependent properties of CLZA:Cr3+ were also studied. Two thermal processes (thermal quenching and thermal ionization) were observed and discussed in detail.
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