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Sol-Gel法制備SrHfO3:Ce閃爍材料及發(fā)光特性
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遼寧省自然科學(xué)基金(20062001)和遼寧省科技攻關(guān)計劃項目(2005222009)


Preparation and Luminescence Characteristic of SrHfO3:Ce Scintillator Prepared by Sol-Gel Process
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    摘要:

    用溶膠-凝膠法(Sol-Gel)合成SrHfO3:Ce納米粉體, 研究煅燒溫度及pH值對前驅(qū)體的作用以及摻雜不同含量Ce3+對試樣發(fā)光特性的影響。用TG-DTA、XRD、SEM等測試手段對試樣進(jìn)行了表征。結(jié)果表明:溶膠pH值控制在2.8時, 經(jīng)900 ℃煅燒得到SrHfO3:Ce粉體粒度均勻,粒徑約為50 nm,摻雜Ce摩爾含量1.5%時試樣的發(fā)光相對峰值最高。385 nm波長作用下激發(fā)光譜存在200~340 nm寬帶譜,分別在218,242,308 nm波長處出現(xiàn)3個激發(fā)峰。用218 nm激發(fā)的發(fā)射光譜

    Abstract:

    Ce doped SrHfO3 nano-powders are synthesized by sol-gel process. The effects of pH value and calcining temperature for precursor and different Ce contents on the luminescence characteristic of specimen are studied. XRD, TG-DTA and SEM are employed to analyze the phase change and the characteristics of specimen. Results show that the powders have an uniform granularity with a dimension of about 50 nm, and good dispensability and polygonal morphology when calcined at 900 ℃ for 2 h and the sol pH value is controlled at 2.8. The maximum light band intensity appears if dopping 1.5% Ce (molar fraction). There is a broad band spectrum from 200 nm to 340 nm in the excitation spectra for the 385 nm light, peaking at 218 nm, 242 nm and 308 nm. There are three emission bands in the emission spectra excited by the 218 nm light, peaking at 380 nm, 487 nm and 526 nm. Only one emission band appears in the emission spectra excited by the 242 nm light and the 308 nm light. respectively, peaking at 393 nm and 403 nm. But The relative intensity of the first emission lights is stronger than the others due to the different transition probabilities for the electron transitions between different energy levels in SrHfO3:Ce

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張佳瑢,馬偉民,聞 雷,尹 凱,王華棟,安玉良. Sol-Gel法制備SrHfO3:Ce閃爍材料及發(fā)光特性[J].稀有金屬材料與工程,2009,38(7):1304~1309.[Zhang Jiarong, Ma Weimin, Wen Lei, Yin Kai, Wang Huadong, An Yuliang. Preparation and Luminescence Characteristic of SrHfO3:Ce Scintillator Prepared by Sol-Gel Process[J]. Rare Metal Materials and Engineering,2009,38(7):1304~1309.]
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