Weak thermal quenching of the luminescence in the Ca₃Sc₂Si₃O₁₂:Ce³⁺garnet phosphor

Abstract

We report results of the luminescence properties of the three garnet type phosphors Ce3+-doped Ca3Sc2Si3O12 (CSSO:Ce3+), Sr3Y2Ge3O12 (SYG:Ce3+) and Y3Al5O12 (YAG:Ce3+), investigated using optical spectroscopy techniques and vacuum referred binding energy (VRBE) diagram analysis.

Vibrationally induced color shift tuning of photoluminescence in Ce3+-doped garnet phosphors

“…For CSS:Ce 3+ , the integrated emission intensity exhibits an almost linear decrease as a function of increasing temperature up to T = 860 K. We note that this reduction in emission intensity has been related to a decrease in the absorption strength of the 4f -5d 1 transition. 11 By bringing together the PL results we observe some features common to the different phosphors: the 2 F 7/2 band has much stronger intensity and larger FWHM than the 2 F 5/2 band [ Fig. 2(c)], indicating that the Ce 3+ emission is primarily dominated by the 5d 1 -2 F 7/2 transition, and the FWHMs of all bands progressively increase due to the thermal broadening effect.…”

“…Table 1). 11 As the 2 E g values are mainly determined by the centroid shift e c and the cubal crystal field splitting D, of which D is inversely proportional to the Ce-O bond length (R) to a power of 5, 12,16 the higher 2 E g for SYG:Ce 3+ with respect to YAG:Ce 3+ may thus be explained by the larger R value for SYG:Ce 3+ (cf. 2.62 Å vs. 2.45 Å, see Table 1).…”

“…The dodecahedral coordination of A may be described as a slightly tetragonally distorted cubal environment, the tetragonality of which typically increases when A ions are substituted by Ce 3+ . 7,10,11 Two major effects dictate the PL properties; the centroid shift and the crystal field splitting. The centroid shift refers to a lowering in the average energy of the 5d levels of the Ce 3+ ions due to a decrease in the interelectronic repulsion, cf.…”

Photoluminescence tuning in a novel Bi3+/Mn4+ co-doped La2ATiO6:(A = Mg, Zn) double perovskite structure: phase transition and energy transfer

“…In practice, the working temperature of pc-WLEDs can reach 150°C, which will greatly influence the emission intensity, luminescence lifetime and chromaticity of phosphors. [48][49][50] Hence, thermal stability is a very important index for phosphors to evaluate its practical application in pc-WLEDs lighting area. In this regard, the thermal stability of LMT (1z) :0.005Bi 3+ , zMn 4+ (0 ≤ z ≤ 0.01), LZT (1-y) :0.005Bi 3+ , yMn 4+ (0 ≤ y ≤ 0.01) and LM (1-w) Z w T:0.005Bi 3+ , 0.002Mn 4+ (0 ≤ w ≤ 0.01) are detected from 25 °C to 250 °C by temperaturedependent PL spectra (Figure 11).…”

Design and fabrication of lutetium aluminum silicate glass and nanostructured glass for radiation detection

“…Based on the Gaussian peak fitting (Figure 5B), two characteristic excitation peaks at around 327 and 349 nm, and two characteristic emission peaks at around 406 and 433 nm can be observed. Above phenomenon can be understood from the viewpoint of the electronic configuration of Ce 3+ dopant and this is typical for Ce 3+ ‐doped phosphors 40‐43 . For details, the ground state 4 f splits into 4 F 7/2 and 4 F 5/2 , and the electrons in 5 d 1 orbit transit to 4 f state would appear two modes: 5 d 1 → 4 F 7/2 and 5 d 1 → 4 F 7/2 .…”