A novel upconversion optical thermometers derived from non-thermal coupling levels of CaZnOS:Tm/Yb phosphors

Alkaline-earth-metal-ion blending enhanced mechanoluminescence of lanthanide ions in MZnOS hosts for stress sensing and anticounterfeiting

“…PL of Ca 0.96Àx Sr x ZnOS:Yb 0.04 is related to 2 F 5/2 -2 F 5/2 transition of Yb 3+ . 31,53 PL of all Ca 0.96Àx Sr x ZnOS:RE 0.04 hosts is much stronger than that of Ca 0.96 ZnOS:RE 0.04 and Sr 0.96 ZnOS:RE 0.04 ; it is clear that the proposed alkaline-earth-metal-ion blending strategy can be utilized to endow MZnOS:RE type ML materials with improved emission performance, especially in the NIR region.…”

“…[14][15][16][17][18] Owing to the simplified synthetic method, 19 convenient post-processing steps and long-term storage stability of inorganic-crystal ML hosts compared to the organic-complex ML hosts, 1,12 inorganic-crystal ML hosts are being extensively explored and utilized to design novel ML materials, 20,21 such as oxonitridosilicates BaSi 2 O 2 N 2 , 22 niobates (Li, Na)NbO 3 , 15 (Ca, Sr) 2 Nb 2 O 7 , 23 aluminate SrAl 2 O 4 24, 25 and quaternary oxysulfides (MZnOS, M = Ca, Sr, and Ba). [26][27][28][29][30] MZnOS is an important kind of host to design ML materials, [31][32][33] because flexible ML emission can be conveniently achieved via partially replacing the M 2+ (M = Ca, Sr, and Ba) sites of the MZnOS host with different dopant ions, such as transition metal ions [33][34][35][36][37][38][39] and lanthanide ions. 27,40,41 Benefitting from the rich energy level property of lanthanide ions, 42 doping MZnOS with lanthanide ion-dopants is being frequently employed to achieve multi-waveband ML.…”

“…27,40,41 Benefitting from the rich energy level property of lanthanide ions, 42 doping MZnOS with lanthanide ion-dopants is being frequently employed to achieve multi-waveband ML. 2,27,43 Although the rich energy level property of lanthanide ion dopants can be preserved in the MZnOS host, 31,44 the MZnOS with same lanthanide ion dopant usually exhibits the similar ML color, 27,45 because the emission color is mainly determined from corresponding maximum emission wavelength. 3,46,47 Since Wang demonstrated tunable ML color from lanthanide ion dopants via incorporating different lanthanides ions into the unary CaZnOS host, 44 the enhanced ML from lanthanide ion dopants is strongly anticipated for the possible application of ML in stress sensing and information encryption domains.…”

“…MZnOS is an important kind of host to design ML materials, 31–33 because flexible ML emission can be conveniently achieved via partially replacing the M 2+ (M = Ca, Sr, and Ba) sites of the MZnOS host with different dopant ions, such as transition metal ions 33–39 and lanthanide ions. 27,40,41 Benefitting from the rich energy level property of lanthanide ions, 42 doping MZnOS with lanthanide ion-dopants is being frequently employed to achieve multi-waveband ML.…”

Upconversion thermal enhancement of 2H11/2→4I15/2 of Er3+ and blue emission of impurity Tm3+ in Sr3(PO4)2:Er3+/Yb3+

“…Recently, some Tm 3+ /Yb 3+ co‐doping blue UCL materials have been already reported in detail, which includes Tm 3+ /Yb 3+ co‐doped CaZnOS, 18 Tm 3+ /Yb 3+ co‐doped NaY 9 (SiO 4 ) 6 O 2 , 19 Tm 3+ /Yb 3+ co‐doped Bi 2 SiO 5 @SiO 2 , 20 Tm 3+ /Yb 3+ co‐doped Na 5 Lu 9 F 32 single crystal, 21 and so on. However, a little amount of impurity Tm 3+ (a few ppm) in the raw materials will cause UCL phosphors to emit bright blue UCL, which is rarely reported.…”