Unraveling the impact of different thermal quenching routes on the luminescence efficiency of the Y₃Al₅O₁₂:Ce³⁺phosphor for white light emitting diodes

Abstract

Ratio of the radiative and nonradiative transition rates of YAG:Ce3+ phosphor, affected by mode-selective vibrational excitation with an IR laser.

Distinctive Ce3+ luminescence from single-crystalline and glassy Ce:LaB3O6

“…In contrast, glassy Ce:LBO is slightly curved in the logarithmic scale and can be fitted with two short lifetime components of 12 and 33 ns, with a relative decay ratio of 33 and 67%, respectively. Compared with the lifetimes of Ce 3+ in an efficiently emitting host, 1,37 which are in the order of a few tenths of seconds, the measured ones in LBO samples are uncommonly short, suggesting that they are dominated by some sort of quenching, rather than radiant luminescence.…”

“…Cerium (Ce 3+ ) is a bright activator widely used in optical applications, in particular, phosphors for white light-emitting diodes and scintillators for radiation detectors. [1][2][3][4][5][6][7] In general, this dopant exhibits an efficient and fast emission due to the 5d-4f parityallowed electric dipole transition, e.g. in Ce:Y 3 Al 5 O 12 (YAG) 6 and Ce:LaBr 3 crystals 7 .…”

Synthesis, crystal structure, and anti‐thermal quenching performance of Lu2Sr(1−x)Al4SiO12:xEu2+ phosphors

“…Based on the self‐ionization thermal quenching model, a probable mechanism for anti‐thermal quenching can be proposed, that is, the trap capture model 22 . This model can be illustrated in Figure 14.…”

“…For example, Y 3 Al 5 O 12 :Ce 3+ reported by Lin et al. has the tunable luminescence properties and excellent thermal stabilities, 22 but it is far from realizing anti‐thermal quenching characteristics.…”

Drastic Ce3+ Insertion Enhancement in YAG Garnet Nanocrystals Through a Solvothermal Route

“…Cm-sized YAG:Ce crystals grown by the Czochralski technique (Arjoca et al, 2015) and the temperature gradient technique (TGT) under Ar atmosphere (Zhao et al, 2003) incorporate less than 0.2 mol.% Ce 3+ . Micron-sized crystals, obtained by solid-state synthesis from CeO 2 , Al 2 O 3 and Y 2 O 3 powders annealed at 1500 °C for 5 h, under Ar/H 2 atmosphere, can incorporate homogeneously up to 3 mol.% Ce 3+ (George et al, 2013;Lin et al, 2020). Agglomerated sub-micron YAG:Ce crystals produced by coprecipitation, Pechini and sol-gel methods, involving rather similar annealing temperatures, allowed to incorporate Ce concentrations of a few percent, between 3 and 5 mol.% Ce, (Bachmann et al, 2009;He et al, 2016) thus comparable to the above the solid-state route.…”