Efficient and Tunable Electroluminescence from In Situ Synthesized Perovskite Quantum Dots

• DOI: 10.1002/smll.201804947
• Publication Date: 2019-01-29T02:47:28Z
• Authors: Hongling Yu; Heyong Wang; Jiangbin Zhang; Jun Lu; Zhongcheng Yuan; Weidong Xu; Lars Hultman; Artem A. Bakulin; Richard H. Friend; Jianpu Wang; Xiao‐Ke Liu; Feng Gao
• Keywords: energy transfer; light-emitting diodes; tunable emission; organic-inorganic hybrid perovskites; 540; Condensed Matter Physics; 530; 01 natural sciences; 7. Clean energy; 0104 chemical sciences; energy transfer; light-emitting diodes; organic-inorganic hybrid perovskites; tunable emission; MD Multidisciplinary; Nanoscience & Nanotechnology; Den kondenserade materiens fysik

AbstractSemiconductor quantum dots (QDs) are among the most promising next‐generation optoelectronic materials. QDs are generally obtained through either epitaxial or colloidal growth and carry the promise for solution‐processed high‐performance optoelectronic devices such as light‐emitting diodes (LEDs), solar cells, etc. Herein, a straightforward approach to synthesize perovskite QDs and demonstrate their applications in efficient LEDs is reported. The perovskite QDs with controllable crystal sizes and properties are in situ synthesized through one‐step spin‐coating from perovskite precursor solutions followed by thermal annealing. These perovskite QDs feature size‐dependent quantum confinement effect (with readily tunable emissions) and radiative monomolecular recombination. Despite the substantial structural inhomogeneity, the in situ generated perovskite QDs films emit narrow‐bandwidth emission and high color stability due to efficient energy transfer between nanostructures that sweeps away the unfavorable disorder effects. Based on these materials, efficient LEDs with external quantum efficiencies up to 11.0% are realized. This makes the technologically appealing in situ approach promising for further development of state‐of‐the‐art LED systems and other optoelectronic devices.