Abstract
The effect of SiO2capping on the optical properties of nanoparticles was investigated. The photoluminescence (PL) intensity was successfully improved by SiO2-capping. Sr2MgSi2O7:Eu,Dy nanoparticles were prepared by laser ablation in liquid. The SiO2capping was performed using the Stöber method with ultrasonication. The TEM images indicated that the Sr2MgSi2O7:Eu,Dy nanocrystal was capped with amorphous SiO2, and the shape of the completely capped nanoparticle was an elliptical nanorod, which aggregated after a long SiO2capping reaction time. The peak wavelength and the shape of the PL spectra were not changed by the pelletization and the laser ablation in liquid. The PL intensity of SiO2capped nanoparticles was significantly increased. Nonradiative relaxation via surface defects and energy transfer to water molecules decrease the PL intensity. These phenomena accelerate in the case of nanoparticles. SiO2capping would prevent these phenomena and improve the optical properties of nanoparticles. The combination of laser ablation in liquid and the chemical reaction is important to expand the applications of this method in various research fields.
Highlights
Extensive studies have recently been conducted regarding laser ablation in liquid because of the high purity and simplicity of preparing a colloidal solution
Laser ablation in liquid has generally been applied to the preparation of metal nanoparticles such as gold and silver, and this technique has significantly improved during the 2000s [2,3,4,5,6,7,8,9]
No transformation of Sr2MgSi2O7 to another phase was observed during the sintering of the target and the laser ablation in liquid
Summary
Extensive studies have recently been conducted regarding laser ablation in liquid because of the high purity and simplicity of preparing a colloidal solution. Laser ablation in liquid has generally been applied to the preparation of metal nanoparticles such as gold and silver, and this technique has significantly improved during the 2000s [2,3,4,5,6,7,8,9]. The nanoparticles prepared using this method were collected with high efficiency This method was used for metal and for organic materials [5, 8, 10] and ceramics [8, 11]. Some researchers have applied the technique of laser ablation in liquid to phosphor materials because the resulting nanoparticles have unique optical properties and various potential applications [12]
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