Strong energy transfer and color tunable emission in Eu2+ and Mn2+ co-doped Na2BaSr(PO4)2 phosphor. Issue 10 (15th May 2023) - Tang, Jiamin
Absract: The new dual-emitting and color tunable single phase of Na2 BaSr(PO4 )2 :0.03Eu 2+, x Mn 2+ (NBSP:0.03Eu 2+, x Mn 2+ ) phosphor are successful prepared in this work. The phase purity and photoluminescence properties are investigated. Regarding to the coordination, valence and cation radius, the Eu 2+ ions occupy the Sr2 and Sr3 site and Mn 2+ ions occupy the Sr3 site. According to the photoluminescence (PL) spectra of NBSP:0.03Eu 2+, x Mn 2+ ( x = 0–0.09), the strong energy transfer (ET) between Eu 2+ and Mn 2+ exists in these phosphors. The strong ET efficiency from Eu 2+ to Mn 2+ is as high as 92%, while the ET mechanism of Eu 2+ and Mn 2+ is quadrupole-quadrupole interaction. Moreover, the CIE coordinate of Eu 2+ and Mn 2+ co-doped Na2 BaSr(PO4 )2 phosphors can realize the color tunable emission from blue to cold white. The temperature dependent photoluminescence intensity of NBSP:0.03Eu 2+, 0.05Mn 2+ phosphor still keeps 75.8% of that initial intensity when the temperature is 150 °C. In summary, the NBSP:0.03Eu 2+, x Mn 2+ phosphors have a promising application in white light LED. Graphical abstract: Image 1 Highlights: A series of NBSP:0.03Eu 2+, x Mn 2+ (x = 0–0.09) phosphors have been synthesized. The strong energy transfer efficiency from Eu 2+ to Mn 2+ is as high as 92% in those phosphors. The temperature dependent emission still keeps 75.8% of initial intensity at 150 °C in NBSP:0.03Eu 2+, 0.05Mn 2+ phosphor. Realizing the color tunable emission from blue to cold white by co-doped Eu 2+, Mn 2+ into NBSP phosphor.