In‐air self‐reduction synthesis and colour tunable luminescence from SrBPO₅:Eu²⁺–Eu³⁺ excited using ultraviolet light

Abstract

SrBPO5:Eu2+–Eu3+ phosphors were synthesized using a conventional solid self‐reduction reaction in an air atmosphere. Samples were characterized using thermogravimetry analysis (TGA), differential scanning calorimetry (DSC), X‐ray diffraction (XRD), Fourier transform infrared (FTIR) spectra, fluorescence spectra and Commission International de l'Eclairage (CIE) data. The results of TGA and DSC showed that the raw materials could completely react at 1000°C. FTIR spectra and XRD results displayed that europium ions of different concentrations do not effect the structure of the hosts. Fluorescence spectra displayed that europium ions exist in bivalent and trivalent forms, and that the emission peak at 403 nm was attributed to the typical 5d−4f transition for Eu2+; 597 nm and 620 nm emissions were assigned to the characteristic transitions of 5D0−7F1, 2 for Eu3+. CIE results depicted that the colour tone of the phosphors could be macro‐controlled from blue to purple by controlling the doping amount of Eu3+.Therefore, relative luminescence intensity between Eu2+ and Eu3+ could be adjusted by controlling the doping concentration of europium to tune the luminescence colour of SrBPO5.

Tetrahedrally coordinated rigid crystal structure enables partial self-reduction of mixed-valence europium for optical thermometric application

“…57 The absorption peaks at 973 cm −1 , 905 cm −1 , and 751 cm −1 were attributed to the asymmetric and symmetric stretching vibration modes of BO 4 . 56,58 The absorption peak at 562 cm −1 was ascribed to the P-O-B bending vibration mode between PO 4 and BO 4 . 59,60 The phase purity of the CaBPO 5 :x% Eu (x = 0-0.7) phosphors with different Eu doping concentrations were checked by powder X-ray diffraction (XRD) measurements, which exhibited intense peaks that were consistent with the simulation pattern of CaBPO 5 (ICSD-77518) without any observed impurity (Fig.…”

“…1b, which shows that the shape and absorption position of two FTIR spectra remain the same, confirming that the doping of Eu ion does not change the lattice structure of the matrix. 56 The resulting absorption is caused by the basic structural groups, BO 4 and PO 4 tetrahedra, in CaBPO 5 . The absorption peak at 1064 cm −1 was generated by the asymmetric stretching vibration modes of PO 4 .…”

Self-Reduction Mechanism and Luminescence Properties of Eu2+-Eu3+Doped Ca(PO3)2 Phosphor

“…The main z E-mail: wjxie@ahjzu.edu.cn ECS Journal of Solid State Science and Technology, 2022 11 086001 reaction is the formation of calcium metaphosphate. The specific reaction equation is 23 Ca H…”

Eu2+/Eu3+-doped oxyfluoride glass-ceramics for modular warm white emission

“…This discovery provided a new direction for making color tunable phosphors with a single rare-earth ion doping agent in a single matrix. Wu et al 35 prepared SrBPO 5 : Eu 2+ -Eu 3+ phosphors in air via a high-temperature solid-phase method. When the Eu concentration was changed, the relative ratio of Eu 2+ -Eu 3+ and the luminescence intensity could be controlled, and the color and luminescence properties could be effectively adjusted.…”