Improved photoluminescence, thermal stability and temperature sensing performances of K+ incorporated perovskite BaTiO3:Eu3+ red emitting phosphors

K+ ions incorporated perovskite Ba(1-x)TiO3:x Eu3+ red emitting phosphors synthesized via facile solid -state reaction method has been investigated in the current study. The photoluminescence and decay time behavior of Ba(1-x-y)TiO3:x Eu3+,yK(+) phosphors are investigated as a function of Eu3+, K+ concentration and temperature. An intense and sharp emission peak at 615 nm was exhibited by the phosphors upon excitation at 397 nm (F-7(0)-> L-5(6)). It can be credited to the hypersensitive electric dipole transition D-5(0)-> F-7(2), which confirms that Eu3+ ions are located at non-centrosymmetric site of the host. The incorporation of K+ ions in optimized Ba0.95TiO3:0.05 Eu3+ phosphor resulted in a remarkable enhancement of photoluminescence intensity by 2.33 times as compared to bare one. The Ba0.89TiO3:0.05 Eu3+, 0.06 K+ phosphors were found to observe good temperature sensing along with adequate thermal stability even at 427 K. Furthermore, the photometric parameters have been also studied which are strongly facilitate the prepared ceramic samples as suitable for potential application in lighting.