Utilizing the energy transfer mechanism to realize color tunable luminescence
Bi3+/Eu3+ co-doped phosphors can realize multi-color luminescence by adjusting the concentration ratio, which makes it possible to manually control the emission color. On this basis, a series of Bi3+/Eu3+ co-doped phosphors SrLaGa3O7:xBi3+,yEu3+ were prepared. The existence of energy transfer from Bi3+ to Eu3+ was verified by spectral analysis. The emission spectra of SrLaGa3O7:xBi3+ show a wide-band peaking at 472 nm. For SrLaGa3O7:xBi3+,yEu3+, the Bi3+ → Eu3+ energy transfer occurs and a series of sharp emitting peaks of Eu3+ can be observed simultaneously. The relative luminescence intensity of Bi3+ and Eu3+ can be modulated by changing the relative concentrations of Bi3+ and Eu3+. Using this mechanism, the color tunable luminescence of SrLaGa3O7:xBi3+,yEu3+ from cyan, through white to orange, and finally to red is realized. By using a 320 nm UV chip and SLG:0.06Bi3+,0.07Eu3+ white phosphor, a white light-emitting diode (WLED) lamp was fabricated with chromaticity coordinates of (0.3199, 0.3083) and a color rendering index Ra of 82. This indicates that the prepared sample is a very promising candidate in the LED field.
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