Cr,Yb-codoped Ca2LaHf2Al3O12 garnet phosphor: electronic structure, broadband NIR emission and energy transfer properties

Dayu Huang; Qiuyun Ouyang; Hui Xiao; Bo Wang; Hongzhou Lian; Qingguang Zeng; Jun Lin

doi:10.1039/D0DT03840G

Cr,Yb-codoped Ca₂LaHf₂Al₃O₁₂ garnet phosphor: electronic structure, broadband NIR emission and energy transfer properties†

Dayu Huang,^ab Qiuyun Ouyang,*^a Hui Xiao,^b Bo Wang,

*^c Hongzhou Lian,*^b Qingguang Zeng^c and Jun Lin

^bc

Author affiliations

* Corresponding authors

^a Key Laboratory of In-Fiber Integrated Optics, Ministry Education of China, and College of Physics and Opotoelectronic Engineering, Harbin Engineering University, Harbin 150001, China
E-mail: Qyouyang7823@aliyun.com

^b State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China
E-mail: hzlian@ciac.ac.cn

^c School of Applied Physics and Materials, Wuyi University, Jiangmen 529020, P. R. China
E-mail: wangbo312@mails.ucas.ac.cn

Abstract

The combination of a broadband near-infrared (NIR) phosphor and phosphor-converted light-emitting diodes (pc-LEDs) has proven to be an ideal choice for a high-efficiency NIR light source. Here, a garnet-type NIR Ca₂LaHf₂Al₃O₁₂:Cr³⁺ phosphor is obtained and its emission covered most of the NIR spectral range. Excited by 460 nm blue light, the maximum peak was located at 780 nm with a full width at half maximum (FWHM) of ∼141 nm and an internal quantum efficiency (IQE) of 33%. Moreover, the NIR spectra can be broadened by doping Yb³⁺ into the Ca₂LaHf₂Al₃O₁₂:Cr³⁺ garnet phosphor. A super broad FWHM of 300 nm and reduced thermal quenching were acquired, originating from the energy transfer of Cr³⁺ → Yb³⁺. The energy transfer process of Cr³⁺ and Yb³⁺ is described by means of an energy level diagram and time-resolved spectrum. Finally, a NIR pc-LED is fabricated by combining the Ca₂LaHf₂Al₃O₁₂:Cr³⁺,Yb³⁺ phosphor with blue chips, which has a photoelectric conversion efficiency of 10%. These results demonstrate the great potential of Ca₂LaHf₂Al₃O₁₂:Cr³⁺,Yb³⁺ in super broadband NIR pc-LED applications.

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DOI: https://doi.org/10.1039/D0DT03840G
Article type: Paper
Submitted: 08 Nov 2020
Accepted: 04 Dec 2020
First published: 08 Dec 2020

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Dalton Trans., 2021,50, 908-916

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Cr,Yb-codoped Ca₂LaHf₂Al₃O₁₂ garnet phosphor: electronic structure, broadband NIR emission and energy transfer properties

D. Huang, Q. Ouyang, H. Xiao, B. Wang, H. Lian, Q. Zeng and J. Lin, Dalton Trans., 2021, 50, 908 DOI: 10.1039/D0DT03840G

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Dalton Transactions

Cr,Yb-codoped Ca₂LaHf₂Al₃O₁₂ garnet phosphor: electronic structure, broadband NIR emission and energy transfer properties†

Abstract

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Cr,Yb-codoped Ca₂LaHf₂Al₃O₁₂ garnet phosphor: electronic structure, broadband NIR emission and energy transfer properties

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