ChemInform Abstract: Luminescence and Thermoluminescence Properties of a Red Emitting Phosphor, Sr4Al14O25:Eu3+

Sr 4−x Al 14 O 25 :xEu 3+ (x varies from 0.02 to 0.06) phosphors were prepared at high temperature via solid-state method. The crystal structure of Sr 4 Al 14 O 25 :Eu 3+ was determined to be orthorhombic crystal system with Pmmm space group. The excitation spectrum of Sr 3.96 Al 14 O 25 :0.04Eu 3+ shows four excitation bands at 308 nm, 360 nm, 383 nm, and 411 nm, respectively. The first excitation band, which is centered at 308 nm, is assigned to the charge-transfer (CTLM) band of Eu 3+ -O 2− , and others are assigned to intra-4f transitions between 393 nm and 450 nm. The emission spectrum of Sr 3.96 Al 14 O 25 :0.04Eu 3+ exhibits a series of emission bands which are attributed to the 5 D 0 - 7 F j (j = 0–4) transitions of Eu 3+ ions. The luminescence studies revealed that the Eu 3+ ions show high luminescence efficiency in emitting red light at 616 nm. The thermo-luminescence glow curve of Sr 3.96 Al 14 O 25 :0.04Eu 3+ shows three overlapped glow peaks between 100 °C and 400 °C which are related to the defects at different trap depths. One of the selected glow curves was analyzed by using glow curve deconvolution (GCD) method. In order to explore the related kinetic parameters of P1 Gartia, Singh & Mazumdar peak shape (PS) method was also used.