Sr3.96Al14O25:Eu2+ ,Dy3+ long persistent materials with different weights of H3BO3 prepared by the high temperature solid-state reaction method were characterized by X-ray powder diffraction (XRD), scanning electronic microscopy (SEM), photoluminescence spectra (PL), and thermoluminescence (TL). The results of XRD indicate that the 3% addition of H3BO3 favorable for the formation of pure phase Sr4Al14O25 , and SrAl12O19 was generated when there is a low content or high content of H3BO3 . The average grain sizes of samples grow bigger with an increase of H3BO3 . PL spectra show that the emission peak does not shift evidently and the emission intensity changes little, indicating that the different amount of H3BO3 has little influence on the crystal field. The decay characteristics and TL measurement show that H3BO3 affects the afterglow properties of Sr3.96Al14O25 :Eu2+ ,Dy3+ , because the increasing H3BO3 leads to more defects in the Sr4Al14O25 matrix.
ZnS:Na thin films with(111) preferred orientation were deposited on glass substrates by vacuum evaporation method.The as-prepared films were annealed in flowing argon at 400—500 °C to improve the film crystallinity and electrically activate the dopants.The structural,optical and electrical properties of ZnS:Na films are investigated by X-ray diffraction(XRD),photoluminescence(PL),optical transmittance measurements and the four-point probe method.Results show that the as-prepared ZnS:Na films are amorphous,and exhibit(111) preferred orientation after annealing at 400—500 °C.The PL emissions at 414 nm and 439 nm are enhanced due to the increase of the intrinsic defects induced by the thermal annealing.However,all the samples exhibit high resistivity due to the heavy self-compensation.
