Single red emission from upconverting ZnGa₂O₄:Yb,Er nanoparticles co-doped by Cr³⁺

Abstract

ZnGa2O4:Yb3+,Er3+,Cr3+ nanoparticles synthesized by a hydrothermal method and further annealing emit bright singular red light under 980 nm excitation and near-infrared light under 254 nm excitation.

Molten‐Salt‐Assisted Annealing for Making Colloidal ZnGa2O4:Cr Nanocrystals with High Persistent Luminescence

“…Actually with increase in thermal annealing of our samples, both trap density and doping efficiency increased. Efficiency of chromium incorporated inside host lattice of ZGOC NCs would be meagered compared to the annealed samples as observed in our earlier work [7] …”

“…ZnGa 2 O 4 :Cr 3+ (ZGOC) has been studied in the realm of scientific research because its extraordinary persistence luminescence property in near‐infrared (NIR) region has rendered it suitable for various applications that touch day‐to‐day human life [1–8] . Some of the most rewarding applications include optical imaging of tumors and grafted cells, [9–11] security and emergency signages, [12] gene silencing in cancer cells and cancer therapy, [13,14] information storage, [15] etc.…”

Rare earth free bright and persistent white light emitting zinc gallo-germanate nanosheets: technological advancement to fibers with enhanced quantum efficiency

“…Optical materials which display bright emission and exhibit persistent luminescence (PerL) have shown tremendous potential as advanced materials to be used in many aspects of daily human life. [1][2][3][4][5][6][7][8][9][10][11] PerL is the emission of light which persists for an extended period of time after the cessation of excitation whose intensity and duration depend on trap density and trap depth.…”

“…29,50 The optical properties of undoped and doped ZnGa 2 O 4 and Zn 2 GeO 4 have been explored extensively by our group for UC, DC and PerL phosphors. [6][7][8]16,19 Powder phosphor particles suffered from poor water dispersibility, non-flexibility, poor mechanical strength, poor adhesion to film and fibers, lower loading, and biocompatibility issues, which restrict their applications on a large scale. 16,51 Scientists have found these problems to be a major issue in the scalability and commercial viability of ZGG based PL and PerL phosphors.…”

Bright aspects of defects and dark traits of dopants in the photoluminescence of Er2X2O7:Eu3+ (X = Ti and Zr) pyrochlore: an insight using EXAFS, positron annihilation and DFT

“…The discovery of more economic and sustainable novel materials with intriguing optical and structural properties has been attracting great attention in the global materials science community. [1][2][3][4][5][6] High-performance materials towards solid-state lighting, efficient phosphors, and nuclear waste hosts would serve as a boon to humanity in terms of providing cheap and environmentally benign energy. A 2 B 2 O 7 -type pyrochlore materials have shown tremendous potential in this direction as multifunctional materials for a variety of applications, particularly defect-induced photo/radioluminescence, catalysis, solid oxide fuel cells, and as a nuclear waste host.…”