Luminescence Characteristics of Polymer Passivized Strontium Aluminate Phosphor

Trivalent Europium ions doped strontium aluminate as the host and passivized by Polyvinyl pyrrolidone (PVP), polyvinyl alcohol (PVA) and carboxyl methyl cellulose (CMC) shows luminescence arising from various 5D2 and 5D07F4 transition of Eu3+ ion upon excitation at 285 nm. The influence of the varied polymers concentration on crystal structures and optical properties was studied by means of X-ray diffraction (XRD) and photoluminescence (PL) spectrometer. XRD pattern revealed a dominant phase characteristics of orthorhombic strontium aluminate compound at 1000°C with an average crystal sizes of the phosphors calculated to be 39 nm – 42 nm. Photoluminescence emission spectral showed a broad peak at 648 nm with PVP sample having the highest luminescence intensity. These materials are likely to have high efficiency of conversion in the LED and display industries without a significance changes in the crystal sizes within the various phosphor samples.