A ratiometric optical thermometer based on Bi3+ and Mn4+ co-doped La2MgGeO6 phosphor with high sensitivity and signal discriminability

Non-rare-earth-doped submicron-grade narrow-band red phosphors for W-LED as well as FED and enhanced Bi3+-doped blue light absorption

“…To determine the case of cations (Sr 2+ ,Ge 4+ ) occupied by doped ions (Bi 3+ ,Mn 4+ ), the radius difference is key factor which can be calculated by the following formula. 40 R d (CN) is the radius of doped ions (Bi 3+ ,Mn 4+ ) and R m (CN) is the radius of cations (Sr 2+ ,Ge 4+ ) in the crystal structure (Table S2, ESI†).…”

“…To determine the case of cations (Sr 2+ ,Ge 4+ ) occupied by doped ions (Bi 3+ ,Mn 4+ ), the radius difference is key factor which can be calculated by the following formula. 40…”

Enhancing the luminescence performance of an LED-pumped Mn4+-activated highly efficient double perovskite phosphor with A-site defectsvialocal lattice tuning

“…Specifically, the non-radiative ET of Mn 4+ ions is determined by the exchange and electric multipolar interactions. The concentration quenching mechanism of the LMTO:Mn 4+ phosphor is studied by the following equation: 39 where R c and x c are the critical distance of ET and the quenching concentration and V and Z are the volume of the unit cell and the number of its sites that can be replaced by the luminescent center, respectively. In this case, x c , V and Z are 0.004, 252.49, and 2.…”

“…Therefore, the non-radiative ET of Mn 4+ ions in the LMTO matrix is mainly contributed by the electric multipole interactions. 39 According to the PL spectrum, the Commission Internationale de l'Eclairage (CIE) chromaticity diagram of the LMTO:0.4 mol%Mn 4+ phosphors is shown in Fig. 5(b).…”

An Er3+ doped Ba2MgWO6 double perovskite: a phosphor for low-temperature thermometry

“…BMW was also demonstrated as a promising host for Eu 3+ with S r = 1.2% K −1 at 120 K from 77 to 200 K. 18 For further comparison, some outstanding materials doped with different rare earth elements operating at low temperature are recalled, for instance: La 2 MgTiO 6 :V 5+ , Cr 3+ (1.96% K −1 at 165 K), 16 La 2 MgTiO 6 :Pr 3+ (1.28% K −1 at 350 K), 52 bismuth silicate glass Bi 2 SiO 5 @SiO 2 doped with Tm 3+ /Yb 3+ (S r = 1.95% K −1 at 300 K) 60 and doped with Nd 3+ (S r = 1.43% K −1 at 300 K), 71 LaGaO 3 :Nd 3+ (S r = 1.8% K −1 at 280 K), 72 and SrGdF 7 :Tm 3+ /Yb 3+ (S r = 1.97% K −1 at 353 K). 73 Moreover, the transition metal ion (TM 3+ )-doped phosphors have been recently demonstrated to be particularly effective and flexible ratiometric thermometers with high relative sensitivity such as CaHfO 3 :Cr 3+ (S r = 1.89% K −1 at 353 K), 74 Bi 2 Al 4 O 9 :Cr 3+ (S r = 1.24% K −1 at 290 K), 75 Gd 2 ZnTiO 6 :Mn 4+ ,Bi 3+ (S r = 2.4% K −1 at 423 K), 76 NaLaMgWO 6 : Mn 4+ ,Pr 3+ ,Bi 3+ (S r = 3.39% K −1 at 573 K), 77 La 2 MgGeO 6 :Mn 4+ , Bi 3+ (S r = 3.03% K −1 at 383 K), 78 etc.…”