Ratiometric optical thermometry based on a Dy³⁺, Eu³⁺ co-doped GdAl₃(BO₃)₄ phosphor

Abstract

Rare earth doped phosphors have been extensively used as self-calibrated ratiometric thermometers for their contactless, noninvasive and high precision properties. However, the drawbacks of low relative sensitivity and signal discernability...

Realization of Broadband Near-Infrared Emission with High Thermal Stability in YGa3(BO3)4: Cr3+ Borate Phosphor

“…The Huang–Rhys factor ( S ) value is very close to 1, indicating that the YGBO: 0.075Cr 3+ sample has a weak electron–phonon coupling strength. The calculated optical band gap from the DR spectrum of the YGBO host is 4.60 eV (Figure S4), which is higher than those reported in the literature for other borate hosts such as GdAl 3 (BO 3 ) 4 ( E g = 4.34 eV) . A larger band gap can effectively suppress the thermal ionization process and nonradiative process of Cr 3+ ions …”

“…The calculated optical band gap from the DR spectrum of the YGBO host is 4.60 eV (Figure S4), which is higher than those reported in the literature for other borate hosts such as GdAl 3 (BO 3 ) 4 (E g = 4.34 eV). 50 A larger band gap can effectively suppress the thermal ionization process and nonradiative process of Cr 3+ ions. 51 Figure 4c demonstrates the measured temperature-dependent luminescence decay curves.…”

CaAl2Si2O8:Dy3+, Eu3+: synthesis, luminescence properties, energy transfer, and tunable emission

“…Thus, Dy 3+ and Eu 3+ co-doping is an effective method for the adjustment of luminescence properties. Up to now, Dy 3+ and Eu 3+ co-doped luminescence materials have been researched, for example BaLa-LiWO 6 :Dy 3+ /Eu 3+ , 23 La(PO 4 ):Dy 3+ , Eu 3+ , 24 Ca 3 MgSi 2 O 8 :Eu 3+ , Dy 3+ , 25 GdAl 3 (BO 3 ) 4 :Eu 3+ , Dy 3+ , 26 and Ca 2 KZn 2 (VO 4 ) 3 :Eu 3+ , Dy 3+ . 27 It can be found that the emission combination of Dy 3+ (blue and yellow light) and Eu 3+ (red-orange and red light) can be used to adjust and improve the luminescence properties of Dy 3+ and Eu 3+ codoped luminescence materials by changing the ratio between Dy 3+ and Eu 3+ ions.…”

To achieve tunable-color emission in a novel tri-doped phosphate sulfate phosphor: Tb3+ as the energy transfer bridge

“…[7][8][9][10][11][12][13][14][15][16][17][18] Generally, the emission spectrum of Eu 3+ is attributed to the 5 D 0,1,2 -7 F J transitions ( J = 4, 3, 2, 1, and 0), and presents an intense red emission. [19][20][21][22][23][24][25] However, the parity-and spin-forbidden transitions during emission due to Eu 3+ 4f-4f absorption transitions result in a weak emission intensity under blue and near-UV (NUV) excitation. This makes them unsuitable for LED applications.…”