Chromaticity-Tunable Emission of Sr[sub 3]AlO[sub 4]F:Ce[sup 3+] Phosphor: Correlation with Matrix Structure and Application in LEDs

phosphors were synthesized by a high temperature solid-state reaction method, and their luminescence properties were investigated. ions occupy two different sites in these phosphors, and the different emissions derived from the two luminescent centers are discussed in terms of the matrix structure. The site occupancy and energy-transfer process give rise to the concentration-dependent luminescence behaviors, and the emission color may be tuned in a large color gamut from blue-green to yellow-green by controlling the concentration. Because the phosphors exhibit a strong absorption in the range of near-UV to blue spectral region, the phosphors were utilized to fabricate the phosphor-converted light emitting diodes. The results show that the phosphors have potential applications in light emitting diode (LED) devices.