Abstract
The crystal structure of a Eu2+-activated SrCaSiAl2O7 phosphor was refined and determined as a tetragonal structure with the refinement converged to Rp = 7.05%, Rwp = 10.67%, and χ2 = 2.637 by Rietveld refinement using a synchrotron light source. By doping different contents of Eu2+, the emission peaks gives a range between 526 nm and 535 nm. The estimated Stokes shifts and Commission International de l’Eclairage (CIE) chromaticity coordinates are 16576–16896 cm−1 and (0.3155, 0.5073) to (0.3685, 0.5284), respectively. By tuning the ratio of phosphors and silicone, the optical properties of the three-band white LEDs could be tuned, changing the CIE chromaticity coordinates from yellow (0.4343, 0.4857) to white-light (0.3311, 0.3460), the correlated color temperature (CCT) between 3599 K and 5558 K, and color rendering index (Ra) in the range 83.1 to 79.1, under a forward bias current of 350 mA.
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