Modulating
the local environment around the emitting ions with
component screening to increase the quantum yield and thermal stability
is an effective and promising strategy for the design of high-performance
fluorescence materials. In this work, smaller Lu3+ was
introduced into the La3+ site in a Mn4+-activated
LaAlO3 phosphor with the expectation of improving the luminescence
properties via lattice contraction induced by cation substitution.
Finally, a La1–x
Lu
x
AlO3:Mn4+ (x = 0–0.04) perovskite phosphor with a high quantum yield of
86.0% and satisfactory thermal stability was achieved, and the emission
peak at 729 nm well matches with the strongest absorption peak of
the Phytochrome PFR. The favorable performances could be
attributed to the suppressed cell volume and superior lattice rigidity
after the substitution of Lu3+. This work not only obtains
a highly efficient La1–x
Lu
x
AlO3:Mn4+ (x = 0.02) phosphor, which holds great potential for application
in plant-cultivation light-emitting diodes, but also provides an applicable
strategy for further investigation of far-red-emitting phosphors.
A single‐phase multicolor emitting phosphor, Ca3Al2O6:Ce3+,Li+, was prepared by a solid‐state reaction. When the Ce3+ concentration is lower than 0.030 (molar ratio in Ca3Al2O6), yellow and greenish blue emissions can be observed under the excitation by a blue and a near UV light, respectively. The yellow‐emitting phosphor possesses an internal quantum efficiency of 89%. Additional purplish blue emission turns up when Ce3+ concentrations are higher than 0.040. Tunable emission bands are originated from Ce3+ ions on different Ca sites in Ca3Al2O6. Although the emission band of purplish blue or greenish blue overlaps the excitation band of yellow emission, and the distances between the unlike Ce3+ ions are in the range of electric dipole–dipole interaction, no energy transfer is observed. Furthermore, emission wavelengths for the yellow, greenish blue, and purplish blue emission show little change upon increasing Ce3+ concentrations.
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