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Spectroscopic properties of cerium in sol--gel glasses

机译：溶胶-凝胶玻璃中铈的光谱性质

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Glasses containing Ce were prepared by the sol--gel method at elevated temperatures. Two parallel series, one in air and one in nitrogen atmosphere, were obtained. The main constituent of the glasses was silica SiO_2 obtained by hy- drolysis of ethoxysilane (TEOS). Spectroscopic properties of the glasses were studied by time-resolved and steady-state luminescence spectroscopy. In the present paper we made an effort to distinguish between the blue luminescence arising from Ce(III) and that obtained from the silica host which is connected with defects in the matrix. While the spectra of both pure si1ica and Ce activated silica excited at 337 nm or longer wave1ength have the similar emission peaking between 400 and 450 nm, the emission of silica is broader and its decay time shorter than that of Ce(III). It seems that Ce quenches the luminescence of the silica centers. When excited at 308 nm by an excimer laser we detect short-lived emission of Ce(III) peaking between 350--380 nm which may be due to excitation to the conductivity band and sub- sequent recombination of the excited electrons with a hole.
机译：含有铈的玻璃是通过溶胶-凝胶法在高温下制备的。获得了两个平行系列，一个在空气中，一个在氮气氛中。玻璃的主要成分是通过乙氧基硅烷（TEOS）水解获得的二氧化硅SiO_2。通过时间分辨和稳态发光光谱研究了玻璃的光谱性质。在本文中，我们努力区分了Ce（III）产生的蓝色发光和与基质中的缺陷有关的二氧化硅基质获得的蓝色发光。尽管纯硅和在337 nm或更长波长处激发的Ce活化二氧化硅的光谱在400至450 nm之间具有相似的发射峰，但二氧化硅的发射更宽，其衰减时间比Ce（III）短。铈似乎淬灭了二氧化硅中心的发光。当受激准分子激光在308 nm激发时，我们检测到Ce（III）的短时发射峰值在350--380 nm之间，这可能是由于对导电带的激发以及随后激发的电子与空穴的复合。

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