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

Abstract

A critical challenge in the field of phosphor converted white light emitting diodes (pc-WLEDs) pertains to understanding and controlling the variation of emission color with device temperature.

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

“…First, the study of the emission spectra as a function of x (Figure 4A) shows a wavelength shift (Δλ) of the PL peak from 541 nm for x 0.5 mol.% to 580 nm for x 30 mol.%. This red-shift upon increasing cerium concentration has been already observed, to a lesser extent, in micron-sized YAG (from 541 nm for 1 mol.% Ce to 553 nm for 3 mol.% Ce) (Lin et al, 2018) and in other garnet phases (Haranath et al, 2006;Lin et al, 2019;Devys et al, 2017). It is attributed to crystal field modification due to the increase in local distortions in the CeO 8 entities, (Xia and Meijerink, 2017;Ueda and Tanabe, 2019;Wu et al, 2007;Bachmann et al, 2009) as evidenced by the dependence with the unit cell parameter (Figure 4B).…”

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

“…5(d)], the effect of energy-transfer induced concentration quenching is comparable with radiative transitions of Ce 3+ . In addition, the energy transfer rate is found to increase upon elevating temperature due to the twin effect of an increased spectral overlap and a red-shift of the luminescence spectra, 30 see Fig. S5 (ESI †).…”

Ce:(Lu,Sr)3(Al,Si)5O12 transparent ceramics for high-power white LEDs/LDs with ultra-high luminance saturation threshold

“…Meanwhile, the emission peaks generally shifted toward a longer wavelength, ascribing to an increase of the tetragonal crystal field splitting at high operating temperatures. 66…”