Remotely control Eu2+ emissions by modulating structural ordering of PO4 anion-groups in (Sr3-xCax)Ce(PO4)3:Eu2+ phosphors
Source abstract
Abstract
Abstract Spectrally tunable phosphors have been extensively studied for their potential applications in phosphor-converted white light-emitting diodes and display devices. Herein, we synthesize a series of color-tunable (Sr2.95-xCax)Ce(PO4)3:0.05Eu2+ (x = 0–2.95) phosphors via solid-state reaction, which are designed by using eulytite-type phosphate with different PO4 structural ordering, viz., Sr3Ce(PO4)3:Eu2+ with disordered state of PO4 tetrahedrons, and Ca3Ce(PO4)3:Eu2+ with ordered state of PO4 tetrahedrons. In Sr3Ce(PO4)3:Eu2+, the successive substitution of Sr by Ca causes microstructural transformation of PO4 tetrahedrons from disordered state to ordered state. Strikingly, the disorder-to-ordered microstructural variation of PO4 anion-groups remotely controls Eu2+ emissions, yielding adjustable emission from yellow-green to yellow and then green emission and fine tailoring of photoluminescence excitation spectra, which are demonstrated by an in-depth local structure analysis of X-ray, nuclear magnetic resonance and electron paramagnetic resonance. This work provides a deeper understanding on how structural ordering degree affects the local structures of Eu2+ centers.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Luminescence Properties of Advanced Materials · Nuclear materials and radiation effects · Radiation Detection and Scintillator Technologies
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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