Preparation and characterization of green emitting NASO:Tb3+ and red emitting NASO:Eu3+ glasses derived from ions exchanged LTA zeolite

NASO:Tb3+ and NASO:Eu3+ glasses derived from ions exchanged LTA zeolite were successfully prepared by melt quenching method. The microstructure, mechanical and thermal properties were demonstrated, due to the porous structure and low Si/Al ratio of LTA, the Tb3+-doped and Eu3+-doped prepared glasses exhibited the good phase stability, high Vickers hardness (825 kg/mm(2) and 807 kg/mm(2)) and quality thermal conductivity (2.523 W m(-1) K-1 and 2.496 W m(-1) K-1). The emission intensity of NASO:Tb3+ and NASO:Eu3+ glasses showed strong green and red luminescence corresponding to the transitions of D-5(4)-> F-7(5) and D-5(0)-> F-7(2), and the values maintained about 73% and 67% at the temperature of 200 degrees C, indicating the prepared glasses possess good thermal quenching performance. The CIE coordinates of the prepared glasses were calculated to be (0.321, 0.594) and (0.628, 0.361), and the CCT of green and red light were measured to be 1892 K and 5345 K. The results show that the straightforward technique to synthesize NASO:Tb3+ and NASO:Eu3+ glasses is promising for white light illumination source.