Enhanced Luminescence of Long-Wavelength Broadband Near-Infrared Germanate Phosphors

Shuya He; Yuanhong Liu; Tongyu Gao; Ronghui Liu; Guantong Chen; Mobin Duan; Min Cao

doi:10.1021/acsomega.3c00995

Enhanced Luminescence of Long-Wavelength Broadband Near-Infrared Germanate Phosphors

ACS Omega. 2023 Apr 18;8(17):15698-15707. doi: 10.1021/acsomega.3c00995. eCollection 2023 May 2.

Authors

Shuya He¹, Yuanhong Liu¹, Tongyu Gao¹, Ronghui Liu¹, Guantong Chen¹, Mobin Duan¹, Min Cao¹

Affiliation

¹ National Engineering Research Center for Rare Earth, General Research Institute for Nonferrous Metals, and GRIREM Advanced Materials Co., Ltd, Beijing 100088, People's Republic of China.

Abstract

Long-wavelength broadband near-infrared (NIR) phosphors have attracted considerable interest in the fields of medical cosmetology and organic detection because of their special emission band. Herein, Ca₂GeO₄(CGO): Cr⁴⁺ NIR phosphor, presenting a broadband emission with longer wavelength ranging from 1100 to 1600 nm, has been synthesized. Further, the luminescence intensity and quantum efficiency of Cr⁴⁺ could be obviously improved via the energy transfer from Eu³⁺ to Cr⁴⁺. The energy transfer is dominated by the dipole-dipole mechanism, which can be inferred from the spectra and the decay curves. Furthermore, in order to evaluate the potential application, an NIR phosphor-converted light-emitting diode (pc-LED) based on blue chip has been prepared. Consequently, CGO: Eu³⁺, Cr⁴⁺ exhibits proper output power and wider half-width than the NIR LED chip, indicating its great prospect for long-wavelength NIR pc-LED applications.