Synthesis of broadband NIR garnet phosphor Ca₄ZrGe₃O₁₂: Cr³⁺, Yb³⁺ for NIR pc-LED applications

Abstract

Near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs) have outstanding application prospects in many fields such as non-destructive detection, bioimaging and modern agriculture, in which the development of NIR emitting phosphor with...

Design, luminescence properties and applications of Cr3+-doped ScTaO4: a broadband near-infrared phosphor

“…Considering both the results of low-temperature tests and the valence and radius of the ions, we deduced that it is easier for Cr 3+ ions to enter the Sc 3+ octahedral lattice. 17,18…”

Efficient Cr3+-activated NaInP2O7 phosphor for broadband near-infrared LED applications

“…21 Furthermore, the thermal resistance, luminous efficiency, and FWHM of some Cr 3+ activated phosphors can be improved by Yb 3+ co-doping. 22–25 Xu et al reported a highly efficient (IQE = 77%) LiInSi 2 O 6 :Cr 3+ phosphor with NIR emissions peaking at 840 nm, and the prepared pc-LED had an excellent NIR output power (51.6 mW@100 mA). 26 Liu et al improved the optical properties of the LiIn 2 SbO 6 :Cr 3+ phosphor by Zn 2+ co-doping.…”

Broadband Near-Infrared-Emitting Phosphors with Suppressed Concentration Quenching in a Two-Dimensional Structure

“…Nevertheless, the low IQY of LiScP 2 O 7 :Cr 3+ is also less than satisfactory. Xiang et al reported a broadband NIR phosphor Ca 4 ZrGe 3 O 12 :Cr 3+ ,Yb 3+ that also shows that the thermostability can be improved by codoping Cr 3+ and Yb 3+ ions . Therefore, novel materials that provide crystallographic sites for Cr 3+ and Yb 3+ ions may be beneficial for obtaining NIR broadband emissions with much larger fwhm, better thermostability, and higher IQEs.…”

“…25 However, the low thermal stability and internal quantum efficiency (IQY) limit its application in NIR pc- 3+ that also shows that the thermostability can be improved by codoping Cr 3+ and Yb 3+ ions. 26 Therefore, novel materials that provide crystallographic sites for Cr 3+ and Yb 3+ ions may be beneficial for obtaining NIR broadband emissions with much larger fwhm, better thermostability, and higher IQEs. Furthermore, the emission intensity of Cr 3+ also suffers from the concentration quenching effect.…”