Preparation and Luminescence Properties of Lu2SiO5: Ce3+ Thin Film

doi:10.15541/jim20160034

Abstract

Abstract:

Lu₂SiO₅: Ce³⁺ thin film is a promising material for X-ray detection due to its high light output, short decay time, high density, and high spatial resolution. In present work, Lu₂SiO₅: Ce³⁺thin films were prepared by Sol-Gel method. The optimal experimental conditions were obtained concerning solid content, adhesive content, water content, and annealing progress. Under the conditions with air humidity of 85%, sol’s H₂O-Si ratio of 6.6, appropriate amount of PEG400, optimized solid content, and sintering starting from 450℃, the thin films are prepared crack-free with high transparence and excellent luminescent properties. The thickness of its single layer is 167 nm. It is found that water content is the major factor that causes film foggy, and sintering progress affects the reaction of organics and crystallization. Furthermore, solid content and the adhesive content are the two factors controlling the film thickness. The present study may promote the application of Lu₂SiO₅: Ce³⁺ thin films in detection systems.

Key words: Lu2SiO5: Ce3+ thin film, H2O-Si ratio, sintering process, adhesive, solid content, luminescence properties

CLC Number:

O482

WU Shuang, LIU Bo, CHEN Shi-Wei, ZHANG Juan-Nan, LIU Xiao-Lin, GU Mu, HUANG Shi-Ming, NI Chen, XUE Chao-Fan. Preparation and Luminescence Properties of Lu₂SiO₅: Ce³⁺ Thin Film[J]. Journal of Inorganic Materials, 2016, 31(9): 948-954.

Figures/Tables 12

Table 1 Basic composition of sol for preparing LSO: Ce thin film

C₃H₇O₂/mL	H₂O-Si ratio	Lu(NO₃)₃·6H₂O /g	PEG400/mL	Lu/Ce
10	6.6	2.3451	0.45	0.997/0.003

Table 2 Situation of thin films prepared at environment of different humidity and H2O-Si ratio

Humidity	H₂O-Si ratio	Situation
85%	15.0	Foggy
85%	10.0	Foggy
85%	6.6	Transparent
70%	15.0	Foggy
70%	10.0	Transparent
70%	6.6	Transparent
65%	15.0	Transparent
65%	10.0	Unable to form film
65%	6.6	Unable to form film

Fig. 1 Pictures of LSO: Ce thin films prepared by sol with H2O-Si ratios of 10 (a) and 6.6 (b) at humidity of 85%

Fig. 2 DSC curve of xerogel added with PEG

Fig. 3 Microscope images of LSO: Ce thin films with sintering process starting from (a) room temperature and (b) 450℃, and (c) their corresponding emission spectra

Fig. 4 XRD patterns of LSO: Ce thin films sintered at temperature starting from room temperature (a) and 450℃ (b)

Fig. 5 Transmission spectrum of single LSO: Ce thin film prepared by the added sol with appropriate amount of PEG400

Fig. 6 SEM image of single LSO: Ce thin film prepared by the sol with optimized proportion

Fig. 7 Pictures of LSO: Ce thin films with different solid contents(a) but with 9 mL C3H7O2, (b) according to Table 1 and (c) but with 11 mL C3H7O2

Fig. 8 Emission spectra of LSO: Ce thin films with different solid contents Proportioning in Table 1 but 9 mL C3H7O2 (a), proportioning in Table 1 (b) and proportioning in Table 1 but 11 mL C3H7O2 (c)

Fig. 9 AFM images of LSO: Ce thin films with different solid contents According to Table 1 only (a) and with 9 mL C3H7O2 (b)

Fig. 10 Emission spectrum of LSO: Ce thin film and its fitting result

References 21

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Preparation and Luminescence Properties of Lu₂SiO₅: Ce³⁺ Thin Film

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