CsPbX_3(X=Cl,Br,I)钙钛矿量子点的制备及应用研究

Preparation and application of CsPbX_3 (X=Cl,Br,I) perovskite quantum dots

针对传统制备无机钙钛矿量子点(PQDs)采用阴离子交换法导致光电性能变化严重以及使用高毒配体的问题,本文采用一种热注射法合成CsPbX_(3 )PQDs。通过X射线衍射(XRD)、透射电子显微镜(TEM)、高分辨率透射电子显微镜(HRTEM)、光致发光(PL)光谱等表征手段分析了样品的形貌尺寸、晶相结构和光学性质。结果表明:该方法能制备出分散性良好,尺度均一的纯CsPbX_3纳米颗粒,其发射光谱半高宽(FWHM)窄且颜色容易谐调,符合荧光粉对发光效果的要求。将制备的PQDs作为颜色转换材料涂覆在紫外发光二极管(LED)芯片上制造暖白光LED。为将来探索下一代低成本、高效率光电器件的荧光材料提供了一种可行的思路。

Aiming at the problems of anion exchange method to synthesize the traditional preparation of inorganic perovskite quantum dots ( PQDs), such as serious changes in the photoelectric properties and the using of highly toxic ligands,a heat injection method for the synthesis of CsPbX3 PQDs was proposed. The morphology,crystal structure and optical properties of the samples were characterized by means of X-ray diffraction, transmission electron microscopy, high resolution transmission electron microscopy, and photoluminescence spectroscopy. The results show that this method can produce pure CsPbX3 nanoparticles with good dispersion and uniform size, and its emission spectrum has a narrow full width at half maximum ( FWHM) and the color is easy to harmonize. The prepared PQDs were coated as a color conversion material on an ultraviolet light emitting diode ( LED) chip to produce warm white LEDs. This will provide a viable way to explore low-cost, high-efficiency fluorescent materials for the next generation of photovoltaic devices.