Phase evolution induced color-tunable emission for Calcium-phosphate based phosphors.

In this paper, color-tunable emission of Eu 2+ doped Calcium-phosphate based phosphors resulted from the phase evolution of luminescent host was demonstrated. Red emission peaked at 675 nm was tuned to blue emission peaked at 480 nm as the Calcium-phosphate luminescent host evolved from Ca 4 (PO 4 ) 2 O (TTCP) to α-Ca 3 (PO 4 ) 2 (α-TCP) by increasing calcination temperature from 1400 °C to 1500 °C. The phase transformation and the resultant color-tunable emission as well as the dependence of emission on phase composition for Calcium-phosphate based phosphors were investigated in detail. The results presented a promising approach to tailor the luminescent properties for phosphors materials by means of phase evolution of hosts. [ABSTRACT FROM AUTHOR]