Zhang Louwen, Zhou Hai, Chen Yibo, Zheng Zhimiao, Huang Lishuai, Wang Chen, Dong Kailian, Hu Zhongqiang, Ke Weijun, Fang Guojia
International School of Microelectronics, Dongguan University of Technology, Dongguan, 523808, Guangdong, P. R. China.
Key Lab of Artifcial Micro- and Nano-Structures of Ministry of Education of China, School of Physics and Technology, Wuhan University, Wuhan, 430072, P. R. China.
Nat Commun. 2024 Feb 21;15(1):1609. doi: 10.1038/s41467-024-45945-1.
The scalable and low-cost room temperature (RT) synthesis for pure-iodine all-inorganic perovskite colloidal quantum dots (QDs) is a challenge due to the phase transition induced by thermal unequilibrium. Here, we introduce a direct RT strongly confined spontaneous crystallization strategy in a Cs-deficient reaction system without polar solvents for synthesizing stable pure-iodine all-inorganic tin-lead (Sn-Pb) alloyed perovskite colloidal QDs, which exhibit bright yellow luminescence. By tuning the ratio of Cs/Pb precursors, the size confinement effect and optical band gap of the resultant CsSnPbI perovskite QDs can be well controlled. This strongly confined RT approach is universal for wider bandgap bromine- and chlorine-based all-inorganic and iodine-based hybrid perovskite QDs. The alloyed CsSnPbI QDs show superior yellow emission properties with prolonged carrier lifetime and significantly increased colloidal stability compared to the pristine CsPbI QDs, which is enabled by strong size confinement, Sn passivation and enhanced formation energy. These findings provide a RT size-stabilized synthesis pathway to achieve high-performance pure-iodine all-inorganic Sn-Pb mixed perovskite colloidal QDs for optoelectronic applications.
由于热不平衡引起的相变，纯碘全无机钙钛矿胶体量子点（QDs）的可扩展且低成本的室温（RT）合成是一项挑战。在此，我们在无极性溶剂的缺铯反应体系中引入一种直接的室温强限域自发结晶策略，用于合成稳定的纯碘全无机锡 - 铅（Sn - Pb）合金化钙钛矿胶体量子点，其呈现亮黄色发光。通过调节铯/铅前驱体的比例，可以很好地控制所得CsSnPbI钙钛矿量子点的尺寸限域效应和光学带隙。这种强限域室温方法对于更宽带隙的基于溴和氯的全无机以及基于碘的混合钙钛矿量子点具有通用性。与原始的CsPbI量子点相比，合金化的CsSnPbI量子点表现出优异的黄色发光特性，具有更长的载流子寿命和显著提高的胶体稳定性，这是由强尺寸限域、锡钝化和增强的形成能实现的。这些发现提供了一种室温尺寸稳定的合成途径，以实现用于光电子应用的高性能纯碘全无机Sn - Pb混合钙钛矿胶体量子点。
