Shao He, Bai Xue, Pan Gencai, Cui Haining, Zhu Jinyang, Zhai Yue, Liu Jingshi, Dong Biao, Xu Lin, Song Hongwei
State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, People's Republic of China.
Nanotechnology. 2018 Jul 13;29(28):285706. doi: 10.1088/1361-6528/aac00b. Epub 2018 Apr 25.
Inorganic perovskite quantum dots (QDs) have attracted wide attention in display and solid-state lighting because of their easily tunable band-gaps and high photoluminescence quantum yields (PLQY) of green light emission. However, some drawbacks limit their practical applications, including the low PLQY of blue light emission and the instability in the moisture environment. In this work, efficient blue-light emitting CsPbBr perovskite QDs with PLQY of 72% were developed through a bandgap engineering approach. The achieved blue-light emitting PLQY is much higher than the values acquired in the inorganic perovskite QDs in the literature. And the emission color of the as-prepared QDs can be facially tuned by only adjusting the reaction temperature. Further, the mono-dispersed perovskite QDs@SiO composites were constructed benefiting from the low temperature synthesis. The optical performance of the QDs could be well persisted even in the moisture environment. Finally, the as-prepared QDs@SiO composite was fabricated as the QD ink on the anti-counterfeit printing technology, from which the obtained pattern would emit varied color under UV lamp. And the as-prepared composites was also applied for fabricating WLED, with Commission Internationale de l'Eclairage (CIE) color coordinates of (0.33, 0.38) and power efficiency of 32.5 lm W, demonstrating their promising potentials in solid-state lighting.
无机钙钛矿量子点（QDs）因其易于调节的带隙和绿光发射的高光致发光量子产率（PLQY）而在显示和固态照明领域引起了广泛关注。然而，一些缺点限制了它们的实际应用，包括蓝光发射的低PLQY和在潮湿环境中的不稳定性。在这项工作中，通过带隙工程方法开发了具有72%PLQY的高效蓝光发射CsPbBr钙钛矿量子点。所实现的蓝光发射PLQY远高于文献中无机钙钛矿量子点所获得的值。并且仅通过调节反应温度就可以轻松调节所制备量子点的发射颜色。此外，受益于低温合成，构建了单分散的钙钛矿量子点@SiO复合材料。即使在潮湿环境中，量子点的光学性能也能得到很好的保持。最后，将所制备的量子点@SiO复合材料制成量子点油墨应用于防伪印刷技术，从中获得的图案在紫外灯下会发出不同颜色的光。并且所制备的复合材料还被应用于制造白光发光二极管（WLED），其国际照明委员会（CIE）色坐标为（0.33，0.38），功率效率为32.5 lm/W，展示了它们在固态照明方面的广阔应用前景。
