Research On Thermoluminescence And Radio-luminescence Characteristics Of Al₂O₃:C Thin Films

Porous anodic alumina has attracted extensive attention worldwide for its excellentphysical and chemical properties. It has broad application prospects in optical data storageand radiation dose detection. The physical nature research of Al2O3:C films and the physicalmodification by adding other ions in the film are the keys to implement material optimizationand found new luminescence performances. They have great theoretical research value andpractical application value.This paper is mainly focus on the thermoluminescence, radiation luminescence propertiesluminous mechanism and prospect the future development of the Al2O3:C film. First of all,uniformly distributed porous Al2O3:C film was prepared via two-step anodic oxidationmethod. The optical performances such as morphology, structure and thermoluminescencewere characterized by scanning electron microscope (SEM), X-ray energy spectrum analysis(EDX), fluorescence spectrometer (TL) and so on. At the same time, the relationship betweenAl2O3:C thermoluminescence and post-processing conditions such as annealing time,annealing atmosphere and annealing temperature were analyzed in this paper. TLmeasurements show that the porous anodic alumina films without aluminum substrate presentstronger TL intensity under the same irradiation dose, which can be explained by its moreradiation energy absorption resulted by its larger area exposure to radiation. The TL intensityof the annealed samples increases with extension of annealing time after γ irradiation at thesame annealing atmosphere; When annealing temperature is lower than600℃, the TLintensity of Al2O3:C samples with aluminum subsrate increase with increase of annealingtemperature; When annealing temperature is higher than600℃, the TL intensity of Al2O3:Csamples without aluminum subsrate decreases with increase of annealing temperature, andreaches the maximum when the annealing temperature at T=600℃in air. The TL intensity ofporous anodic alumina films annealed in the air is significantly stronger than that annealed invacuum.At the same time, the study finds that different types of irradiation had different effects on Al2O3:C film. In addition, the study indicates that Al2O3:C film under60Co gammairradiation had great RL luminescence, The RL emission spectrum show that the RL glow ofAl2O3:C was happened at440nm or so, and RL glow of annealed samples firstly increase andthen decreases with the increase of the annealing temperature, and reaches the maximumwhen the annealing temperature at T=600℃; The RL intensity had good linear relationshipwith the dose rate between0.01Gy/s and0.9Gy/s, this feature can be used to measure theradiation does rate. The luminescence properties were depended on the preparation processand the reprocessing conditions. this property will be used for online radiation monitoring. Itwill bring great advantages to the real chemical dosimetry and bring huge economic andsocial benefits in the future.