Luminescence properties and energy transfer of YGa_1.5Al_1.5(BO₃)₄:Tb³⁺,Eu³⁺ as a multi-colour emitting phosphor for WLEDs

Abstract

Energy-transfer-based multi-colour emissions in YGa1.5Al1.5(BO3)4:Tb3+,Eu3+ for WLEDs.

Tunable dual‐mode emission with excellent thermal stability in Ca4ZrGe3O12:Eu phosphors prepared in air for NUV‐LEDs

“…It is significant that luminescent intensity of CZGO:0.16Eu at 423 K (150°C) still maintains as much as 91.01% of that measured at room temperature upon 370 nm light irradiation. These results suggest that the as‐prepared phosphors display highly thermal stability, which is superior to that of most reported single‐phased phosphors for UV‐LEDs . The activation energy ( E a ) for thermal quenching of emission of CZGO:0.16Eu can be calculated via Arrhenian Equations,where I 0 and I(T) represent the luminescent intensities at room temperature and different temperatures, respectively.…”

“…These results suggest that the as-prepared phosphors display highly thermal stability, which is superior to that of most reported single-phased phosphors for UV-LEDs. [37][38][39][40][41] The activation energy (E a ) for thermal quenching of emission of CZGO:0.16Eu can be calculated via Arrhenian Equations 31,42 , where I 0 and I(T) represent the luminescent intensities at room temperature and different temperatures, respectively. C corresponds to a constant, while k stands for the Boltzmann constant (8.625 × 10 −5 eV/K).…”

Tunable lanthanide/transition metal ion‐doped novel phosphors for possible application in w‐LEDs: a review

“…Li et al . reported the multicolour emission of YGa 1.5 Al 1.5 (BO 3 ) 4 (YGAB):Tb 3+ ,Eu 3+ and found that the distribution of the isolated sites in the crystalline lattice affected the luminescence properties and energy transfer mechanism . The interaction between the luminescence centres is weak, owing to the large distance between the paired ions in the same unit cell and therefore concentration quenching is less.…”

Tunable emission from green to red in the GdSr2AlO5:Tb3+,Eu3+phosphorviaefficient energy transfer

“…Moreover, the excitation of 7 F 0 / 5 D 3 , 5 L 6 (Eu 3+ ) overlaps with the emission of 5 D 3 / 7 F 5 (Tb 3+ ). 35 To further investigate the energy transfer process, a series of samples of GdSr 2 AlO 5 :2%Tb 3+ ,x%Eu 3+ (x ¼ 0, 0.5, 1, 2, 3, and 5) were prepared whose emission spectra under the excitation at 275 nm are presented in Fig. 5(a).…”