温度条件对光谱增感AgCl晶体光电子特性的影响

利用微波吸收相敏技术检测了光谱增感AgCl立方体乳剂的光电子时间分辨谱,增感样品由于染料吸附引起填隙银离子浓度增加,其光电子衰减比未增感的要快。通过分析增感温度条件与光电子特性的关系,发现温度条件影响了染料吸附程度,进而影响了光电子的衰减特性。温度为45℃时,晶体受染料吸附的影响最大,光电子衰减最快。低于或高于此温度时染料吸附不充分或存在生成大聚集体的趋势,引起晶体填隙银离子浓度的变化较小,光电子衰减较慢。

Effect of Temperature Condition on the Photoelectron Property of the Spectrally Sensitized AgCl Microcrystals

The time-resolved photoelectron spectra of spectrally sensitized cu bic AgCl emulsion are detected with microwave absorption phase-sensitivity tech nique.The decay process of photoelectron is accelerated and becomes faster than that of the unsensitized sample since the concentration of interstitial Agi+io ns is increased when the dye molecules are adsorbed onto the surface of crystal.The influence of temperature condition on the photoelectron decay process is ob tained.Results show that the dye adsorption degree is varied when the sensitizi ng temperature differs,then the decay dynamic changes.The optimal temperature condition is in 45℃in which the adsorption of dye has a larger influence on the crystal property and the photoelectron decay is fastest.When lower or higher t han this condition,the adsorption degree is poor or the dye molecules have a te ndency to form bigger dye-aggregates,then the variance of the interstitial Agi +ions is less than that in 45℃and causes a slower photoelectron decay process.