Effect of B-site substitution on the luminescence, thermal stability and temperature sensitivity of Ba2NaNb5O15:Eu3+/Er3+glass ceramics

Transparent glass ceramic with Ba2NaNb5O15 as the main crystal phase was prepared, and the appropriate heat treatment condition was selected as 710 degrees C/150 min through various characterizations. The luminous intensity and thermal stability were enhanced significantly when the glass ceramic was used as the luminous matrix. After introducing Ti4+ ions as charge compensators, the luminescence performance and thermal stability were further improved, and the reasons for this were analyzed. At 458 K, the luminous intensity of 0.5%Eu3+ doped glass ceramic containing 0.5%Ti4+ can maintain about 65% of room temperature with a chromaticity shift of 5.16 x 10-2. The relative and absolute sensitivities of 0.7%Er3+ doped glass ceramic were 4.04 x 10-3 K-1 and 1.31% K-1. Introducing Ti4+ ions would weaken the population redistribution ability of 2H11/2 and 4S3/2 levels and reduce the temperature sensitivity. However, the sample containing Ti4+ shows good thermal stability, its green emission at 458 K has a small chromaticity shift of 6.45 x 10-3. The research shows that the glass ceramic can be used as a good luminescent host material, and Eu3+/Er3+ doped glass ceramic can be used in the fields of LEDs or temperature sensing.