Green emission from a Eu~(2+)-activated SrAI_2O_4 phosphor: a photoluminescence and electron spin resonance study

摘要

AbstractSrAl2O4Eu2+green-light emitting powder phosphor was prepared within a few minutes at furnace temperature as low as 550 °C by using combustion method. The prepared powder was characterized by X-ray diffraction, scanning electron microscopy and Fourier-transform infrared spectrometry. Several ESR lines are exhibited by the phosphor, and some are seen in the low field region apart from lines in the g ~ 2.0 region. Crystal fields that were relatively strong arose from distortions close to the Eu2+ion lead to lines in the low field region. The photoluminescence of Eu2+-activated SrAl2O4shows a green-emission dominant peak around 514 nm, which can be attributed to the 4f65d1 → 4f7transition of Eu2+ions from the synthesized phosphor particles at an excitation wavelength of 345 nm.