Luminescence property tuning of Yb³⁺-Er³⁺ doped oxysulfide using multiple-band co-excitation

Abstract

Lanthanide ions have abundant excited-state channels which result in a radiation relaxation process generally accompanied by a non-radiation relaxation process. However, non-radiation relaxation processes will consume the activation energy and reduce the luminescence efficiency of the phosphor.Two lasers with an excitation energy which matched the ground state absorption and excited state absorption of ions were used to excite the phosphors to avoid the non-radiation relaxation process. This approach can achieve the purpose of populating specific states of the lanthanide ions, and furthermore effectively tunes the luminescence intensity and color output of the sample. Results show that the red emission intensity of the sample is significantly improved and this is caused by populating the 4 F 9/2 level under simultaneous 1510 nm and 980 nm excitation. Then when the 1510 nm and 808 nm co-operate to excite the sample, the green emission obtained increased sharply because the 2 H 11/2 / 4 S 3/2 states were efficiently populated. As a proof-of-concept experiment, this new approach has potential in the applications of solar cells.

Dual-wavelength enhanced upconversion luminescence properties of Li+-doped NaYF4:Er,Yb glass-ceramic for all-optical logic operations

“…The appropriate combination of rare earth luminescent centers and sensitizers can effectively improve the photon utilization efficiency, [24][25][26] while the introduction of metal ions can reduce the symmetry of the crystal field, effectively break the 4f-4f transition, and improve the luminescence intensity of UC. 22,[27][28][29][30] By matching different excitation wavelengths and changing the excitation power density can also induce electronic transition changes in the material; [31][32][33][34] for instance, dual-wavelength co-excitation can effectively improve the UC luminescence intensity. [35][36][37][38] Thus, a method of combining internal ions doped with dual-wavelength excitation could remarkably enhance UC luminescence.…”

Solvothermal synthesis of columnar Gd2O2S:Eu3+ and a comparative study with columnar Gd2O3:Eu3+

“…Lanthanide compounds, such as hydroxides, oxides, phosphates, fluorides, oxysulfides, and vanadates, have been extensively studied because of their potential applications as high‐performance magnets, luminescent devices, catalysts, and other functional materials based on the electronic, magnetic, optical, and chemical characteristics arising from their f electrons . Among them, the lanthanide (La‐Lu) oxysulfides with high chemical stability and high thermal stability are known as wide‐gap (4.6‐4.8 eV) materials . Gd 2 O 2 S, as the luminescent matrix with good chemical stability, insoluble in water, strong antioxidation, and high luminous efficiency gets more attention from researchers .…”

“…10-13 Among them, the lanthanide (La-Lu) oxysulfides with high chemical stability and high thermal stability are known as wide-gap (4.6-4.8 eV) materials. 14,15 Gd 2 O 2 S, as the luminescent matrix with good chemical stability, insoluble in water, strong antioxidation, and high luminous efficiency gets more attention from researchers. 16,17 As we all know, it is very important to choose a suitable synthesis method for sample preparation.…”

Triple NIR light excited up‐conversion luminescence in lanthanide‐doped BaTiO3 phosphors for anti‐counterfeiting

“…[6][7][8] The representative UV-stimulated fluorescent materials such as organic fluorescent dyes, quantum dots (QDs), and metal-organic frameworks (MOFs) suffer from the inferior stability, background noise, and light bleaching. [9][10][11] In comparison, near-infrared (NIR) light pumped rare-earth-doped UC materials are ideal candidate for optical anti-counterfeiting labels because of the superior physical and chemical stability, big anti-Stokes shift, long luminescence life, light resistance to bleaching, and so…”