Study of concentration and temperature-dependent photoluminescence properties in DyF3-doped fluorophosphate glasses for thermal stable photonic device

Dy3+‐ and/or Sm3+‐doped glass–ceramics containing NaGd(MoO4)2 crystalline phase for warm white light applications

“…No matter how much Dy 2 O 3 is present, the excitation peaks of all samples at the monitoring wavelength of 575 nm exhibit similar peak positions. The positions mentioned (324, 350, 364, 386, 425, 453, and 468 nm) correspond to the transitions of Dy 3+ ions from their ground state ( 6 H 15/2 ) to different excited states (M 17/2 , 6 P 7/2 , 6 P 5/2 , 4 F 7/2 , 4 G 11/2 , 4 I 15/2 , and 4 F 9/2 ) 56–59 . The ideal wavelength (350 nm) for activating Dy 3+ ions in SBNZMG precursor glasses is close to the near‐UV range, indicating that near‐UV light can effectively be used to stimulate SBNZMG: Dy 3+ glasses.…”

“…The positions mentioned (324, 350, 364, 386, 425, 453, and 468 nm) correspond to the transitions of Dy 3+ ions from their ground state ( 6 H 15/2 ) to different excited states (M 17/2 , 6 P 7/2 , 6 P 5/2 , 4 F 7/2 , 4 G 11/2 , 4 I 15/2 , and 4 F 9/2 ). [56][57][58][59] The ideal wavelength (350 nm) for activating Dy 3+ ions in SBNZMG precursor glasses is close to the near-UV range, indicating that near-UV light can effectively be used to stimulate SBNZMG: Dy 3+ glasses. Furthermore, there exists a broadband absorption spanning from 250 to 325 nm that can be attributed to the charge transfer band involving two aspects: (a) from O 2− to Dy 3+ , and (b) the transition of 1 A 1 → 3 T 2 caused by O 2− -Mo 6+ in the [MoO 4 ] 2− group.…”

High color‐purity broad orange‐red emission of Mn2+‐doped transparent phosphate glass–ceramics embedded NaYP2O7 crystals

“…Finally, the activation energy (Δ E ) of thermal quenching was calculated by the Arrhenius equation 57 : $$$$\begin{equation}{I}_T \approx \frac{{{I}_0}}{{1 + A{\mathrm{exp}}\left( { - \frac{{\Delta E}}{{KT}}} \right)}},\end{equation}$$$$where I 0 is the initial fluorescence intensity, I T is the fluorescence intensity at temperature T , and A is the fitting constant. The activation energy of thermal quenching can be obtained from the linear slope of the ln( I 0 / I T −1) and 1/ kT , as shown in Figure 9C.…”

“…The glassceramic exhibits good thermal stability, and its emission intensity at 373 K remains 70% of the initial intensity at 298 K. After cooling, the fluorescence intensity can be restored as well. Finally, the activation energy (ΔE) of thermal quenching was calculated by the Arrhenius equation 57 :…”

Comparative study of luminescence in alkali‐metal‐based yttrium fluoride nanophosphor for biophotonic applications

“…At higher temperature, there is more interaction between electron and phonon that tends to dissipate the excited state thermally and results in fall of emission at high temperature. 45 Furthermore, the well-established Arrhenius equation given below is applied on the temperature-dependent emission spectra of the said nanophosphor to investigate the thermal stability by evaluating activation energy 46,47 :…”