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Dual color tuning in Ce 3+ ‐doped oxyfluoride ceramic phosphor plate for white LED application
Author(s) -
Arredondo Alejandro,
Desirena Haggeo,
Moreno Ivan,
Orozco Hinostroza Ignacio E.
Publication year - 2019
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15929
Subject(s) - phosphor , photoluminescence , materials science , doping , luminescence , analytical chemistry (journal) , color rendering index , color temperature , excitation , blueshift , cerium , ceramic , quantum yield , wavelength , photoluminescence excitation , optoelectronics , optics , chemistry , fluorescence , physics , chromatography , quantum mechanics , composite material , metallurgy
Ceramic phosphor plates of cerium (Ce 3+ )‐doped oxyfluoride were fabricated by the solid‐state reaction method. These phosphors exhibit efficient emission, with the novel feature of color tuning by varying both the doping concentration and excitation wavelength. As the Ce 3+ concentration increases, the excitation spectrum broadens by a factor of 1.6, and the excitation peak wavelength shifts from 390 to 435 nm, and there is a variation in excitation energy of ~ 10%. Luminescence spectrum of low Ce 3+ concentration samples is tuned from blue to green with the change of excitation wavelength. The emission peak exhibits a shift of 58 nm into the red spectral region, varying the Ce 3+ concentration from 0.05 to 0.1 mol% ; whereas this shift is only 6 nm when Ce 3+ content changes from 0.25 to 1 mol%. Photoluminescence ( PL ) quantum yield has achieved 76%. The crystal structure was examined using X‐ray diffraction to explain its possible influence on the redshift luminescence. A proof of concept of white LED was constructed using a 450 nm blue LED chip with an oxyfluoride phosphor plate, showing a luminous efficacy ( LE ) of 64 lm/W with a color rendering index of 74.