β-Ga2O3∶Cr^3＋近红外长余辉纳米颗粒的制备及发光性能

Synthesis and Photoluminescence Properties of β-Ga_2O_3∶ Cr^(3+) Persistent Luminescence Nanoparticles with Near-infrared Afterglow

以三乙二醇为表面配体,利用沉淀法制备了β-Ga_2O_3∶Cr^(3+)近红外(NIR)长余辉纳米颗粒.考察了反应条件对β-Ga_2O_3∶Cr^(3+)的发光性能和晶体结构的影响,并初步探讨了其NIR余辉发光机理.结果表明,当溶液的p H值为7,煅烧温度为700℃时,可获得高纯度的β-Ga_2O_3∶Cr^(3+)纳米颗粒,其平均粒径为30 nm,最大余辉发射波长可调控为750 nm,NIR余辉发光时间长于384 h.本方法得到的β-Ga_2O_3∶Cr^(3+)长余辉纳米颗粒不仅尺寸小,而且NIR余辉时间长,发射波长可调控,在低背景噪音的深组织活体成像中具有潜在的应用前景.

Cr3＋doped gallium oxide（ β-Ga_2O_3∶ Cr3＋） nanoparticles with near infrared（ NIR） persistent luminescence properties were prepared by a facile precipitation method with triethylene glycol as a surface ligand.The persistent luminescence properties and crystal structure of the Ga_2O_3∶ Cr3＋nanoparticles highly depended on p H value of the reaction solution and the sintering temperature. The experimental results showed that pureβ-Ga_2O_3∶ Cr3＋nanocrystal with small grain size（ ca. 30 nm） was obtained after p H value of the reaction solution was adjusted to 7 with ammonium hydroxide,and calcined in air at 700 ℃ for 3 h. The maximum afterglow emission wavelength of the β-Ga_2O_3∶ Cr^（3＋）nanoparticles was 750 nm,which was controlled by the reaction conditions. The NIR afterglow time of the β-Ga_2O_3∶ Cr3＋nanoparticles was estimated to be longer than 384 h. The β-Ga_2O_3∶ Cr3＋ persistent luminescence nanoparticles with small size,long NIR afterglow time and controllable emission band have great potential application in low background noise and deep tissue in-vivo imaging.