Singh Akhilesh Kumar
Department of Physical Sciences, Banasthali Vidyapith, Banasthali-304022, Rajasthan, India.
Methods Appl Fluoresc. 2020 Sep 25;8(4). doi: 10.1088/2050-6120/abb99c.
CsPbBrcolloidal quantum dots have been synthesized by hot-injection method showing spherical shape with an average diameter of ∼10.5 nm. UV-vis absorption of CsPbBrcolloidal quantum dots shows a broad spectrum with an optical bandgap of ∼2.3682 eV. The steady-state photoluminescence measurement reveals a narrow emission peak at 2.352 eV with full-width at half maximum of 0.113 eV. Absolute photoluminescence quantum yield of colloidal quantum dots dispersed in poly(methyl methacrylate) was found to be 60 ± 1%. The time-resolved photoluminescence data recorded at 266 nm excitation were well fitted using a mono-exponential curve with a decay time of 25.36 (5) ns. A luminescent solar concentrator was fabricated using colloidal quantum dots in transparent poly(methyl methacrylate) polymer uniformly coated over glass substrate that shows an external optical conversion efficiency of ∼5.4% under one sun illumination. The experimental results presented in this manuscript reveals that luminescent solar concentrator prepared using colloidal CsPbBrquantum dots shows absorption in wide spectral range, high absorption coefficient, high photoluminescence quantum yield, high external optical conversion efficiency, and good photostability, thermal stability and long-term stability under ambient conditions and therefore are in many ways superior to the other luminescent materials explored for LSC devices.
通过热注入法合成了CsPbBr胶体量子点，其呈现出球形，平均直径约为10.5纳米。CsPbBr胶体量子点的紫外-可见吸收显示出一个宽带谱，光学带隙约为2.3682电子伏特。稳态光致发光测量显示在2.352电子伏特处有一个窄发射峰，半高宽为0.113电子伏特。分散在聚甲基丙烯酸甲酯中的胶体量子点的绝对光致发光量子产率为60±1%。在266纳米激发下记录的时间分辨光致发光数据使用单指数曲线拟合良好，衰减时间为25.36(5)纳秒。使用胶体量子点在均匀涂覆在玻璃基板上的透明聚甲基丙烯酸甲酯聚合物中制备了发光太阳能聚光器，在一个太阳光照下其外部光学转换效率约为5.4%。本手稿中呈现的实验结果表明，使用胶体CsPbBr量子点制备的发光太阳能聚光器在宽光谱范围内有吸收、吸收系数高、光致发光量子产率高、外部光学转换效率高，并且在环境条件下具有良好的光稳定性、热稳定性和长期稳定性，因此在许多方面优于为发光太阳能聚光器器件探索的其他发光材料。
