Optical properties of YMASG:Ce fluorescent ceramics prepared by hot-pressure sintering

Liu, Wenlei; Shen, Jianxing; Pang, Qingle; Wang, Tailin; Han, Xiujun

doi:10.1016/j.ceramint.2023.04.018

Cited by 2 publications

(1 citation statement)

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“…Two basic approaches have been taken to address this issue. Ce: YAG may shift its emission spectrum toward longer wavelengths by changing the material's chemical structure, or the emission spectrum's red component can be boosted by adding luminescence centers [5][6][7][8][9][10][11]. Cerium ions can exist in either a trivalent state, Ce 3+ , or a tetravalent state, Ce 4+ .…”

Section: Introductionmentioning

confidence: 99%

Ce/Mn/Cr: (Re,Y)3Al5O12 Phosphor Ceramics (Re = Gd, Tb and Lu) for White LED Lighting with Significant Spectral Redshift and Improved Color-Rendering Index

Li,

Hanson,

Pang

et al. 2023

Materials

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In order to attain phosphor ceramics with a high Color-Rendering Index (CRI), samples with the composition of Y0.997−xRexCe0.003)3(Al0.9748 Mn2+0.024Cr3+0.0012)5O12(Rex = 0, Gd0.333, Gd0.666, Gd0.997, Tb0.333, Tb0.666, Tb0.997 and Lu0.997 were prepared by solid-state reaction and vacuum sintering, and exhibited potential for high-quality, solid-state lighting. Doping with Cr3+ and Mn2+ effectively enhanced the red component of Ce3+ spectra through the intense energy transfer from Ce3+ ions to Mn2+/Cr3+ ions. The crystal field splitting of [GdO8] and [TbO8] was more extensive than that of [YO8], causing a massive redshift in the Ce3+ emission peaks from 542 to 561 and 595 nm, while [LuO8] had an opposite effect and caused a blueshift with a peak position at 512 nm. White LED devices incorporating Ce/Mn/Cr: (Gd0.333Y0.664)3Al5O12 phosphor ceramic exhibited a high CRI of 83.97, highlighting the potential for enhancing the red-light component of white LED lighting.

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