Massive red shift of Ce³⁺in Y₃Al₅O₁₂incorporating super-high content of Ce

Abstract

In light emitting diodes, Y3Al5O12:Ce (YAG:Ce) is used as a yellow phosphor in combination with blue LEDs but lacks a red component in emission.

YAG:Ce 3+ piezo‐spectroscopy: A high‐sensitive method used for stress characterization of thermal barrier coating

“…Compared with .2‐wt.% doped single crystal YAG:Ce 3+ , 22 the piezo‐spectroscopic coefficient of the 2‐mol.% (1.41 wt.%)‐doped APS–YAG:Ce 3+ specimen in this paper was increased by an order of magnitude. APS–YAG:Ce 3+ is a polycrystalline material with the randomness of grain orientation, and the lattice constant will increase with the rise of Ce 3+ doping concentration 36,37 . Thus, the crystal field of APS–YAG:Ce 3+ has less constraint on electrons, leading to a high piezo‐spectroscopic coefficient.…”

“…APS-YAG:Ce 3+ is a polycrystalline material with the randomness of grain orientation, and the lattice constant will increase with the rise of Ce 3+ doping concentration. 36,37 Thus, the crystal field of APS-YAG:Ce 3+ has less con-straint on electrons, leading to a high piezo-spectroscopic coefficient.…”

Exploiting Desired Phosphor‐In‐Glass for All‐Inorganic Solid‐State White Illumination

“…TQ, internal quantum efficiency (IQE) and external quantum efficiency (EQE) were focused on as the main parameters to evaluate phosphors properties. [24][25][26][27][28][29][30] In this work, we choose four commercial phosphors CASN: Eu, (BS) 3 SO 5 : Eu, YAG: Ce, and (BS) 2 SO 4 : Eu to investigate these properties. [31] Generally speaking, TQ is explained by a configuration diagram coordinate in which the vibration amplitude of the excited energy level increases and the relaxation excited state may reach the intersection (C) of two parabolas if the temperature is high enough, then the system may return directly to the ground state in a non-radiative form through the intersection (Figure S1a, Supporting Information).…”

A review on the structural dependent optical properties and energy transfer of Mn4+ and multiple ion-codoped complex oxide phosphors

“…The Mn 4+ luminescence is easily thermally quenched through an energy-level crossing relaxation (ELCR) between the 4 T 2g excited state and the 4 A 2g ground state due to the role of strong electron-phonon coupling. The thermal quenching of rare earth ions is completely different to that of Mn 4+ since there is no crossing point between the excited states and the ground state of rare earth ions because their 4f orbitals are shielded from the surroundings by the lled 5 S 2 and 5 P 6 orbitals, 139,140 and consequently the multi-phonon deexcitation (MPD) mode is the dominant mechanism responsible for the thermal-quenching of rare earth ions. The thermalquenching probability of Eu 3+ , Tb 3+ , and Dy 3+ luminescence is quite low because the required phonon numbers to bridge the energy gaps of Eu 3+ , Tb 3+ and Dy 3+ are 16, 21 and 10, respectively.…”