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Precipitation of CsPbBr3 Quantum Dots in Borophosphate Glasses Inducted by Heat-treatment and UV-NIR Ultrafast Lasers
Chemical Engineering Journal ( IF 13.3 ) Pub Date : 2020-07-02 , DOI: 10.1016/j.cej.2020.126132
Ying Du , Xin Wang , Danyang Shen , Jun Yuan , Yajie Wang , Sasa Yan , Shuai Han , Yiting Tao , Danping Chen

Low-melting borophosphate glasses were fabricated via melt-quenching and then CsPbBr3 quantum dots (QDs) were synthesized in the glasses by heat-treatment and UV-NIR ultrafast lasers irradiation. CsPbBr3 QDs embedded glasses obtained by heat-treatment were confirmed by X-ray diffraction patterns, TEM images and spectral analyses and behaved excellent thermal and moisture stabilities. Moreover, the behavior of lasers-induced crystallization on the surface and interior of glasses is greatly different. CsPbBr3 QDs could directly be precipitated on the surface of glasses by using low peak power ultrafast lasers irradiation and the subsequent heat-treatment would lead to the reduction of nanocrystalline size because there are defects and crystal nucleuses on the surface of glasses. However, the irradiation of high peak power ultrafast lasers could only nucleate inside glass because of the lack of nucleation points inside glasses and the subsequent heat-treatment was required to precipitate CsPbBr3 QDs. The higher the peak power of ultrafast lasers, the stronger the luminescence intensity of CsPbBr3 QDs and the longer its fluorescence lifetime.



中文翻译:

热处理和UV-NIR超快激光诱导的硼磷酸盐玻璃中CsPbBr 3量子点的沉淀

通过熔融淬火制备了低熔点的硼磷酸盐玻璃,然后通过热处理和UV-NIR超快激光照射在玻璃中合成了CsPbBr 3量子点(QDs)。通过X射线衍射图谱,TEM图像和光谱分析证实了通过热处理获得的CsPbBr 3 QDs嵌入式玻璃,并表现出优异的热稳定性和湿稳定性。此外,激光在玻璃表面和内部的结晶行为也大不相同。溴化铯3通过使用低峰值功率超快激光照射,可以将QD直接沉淀在玻璃表面上,并且随后的热处理将导致纳米晶尺寸的减小,因为玻璃表面存在缺陷和晶核。然而,由于缺乏玻璃内的成核点,因此高峰值功率超快激光的辐照只能在玻璃内成核,并且需要随后的热处理以沉淀CsPbBr 3 QDs。超快激光的峰值功率越高,CsPbBr 3 QD的发光强度越强,其荧光寿命越长。

更新日期:2020-07-02
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