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Employing Polar Solvent Controlled Ionization in Precursors for Synthesis of High‐Quality Inorganic Perovskite Nanocrystals at Room Temperature
Author(s) -
Fang Fan,
Chen Wei,
Li Yang,
Liu Haochen,
Mei Ming,
Zhang Ruan,
Hao Junjie,
Mikita Marus,
Cao Wanqiang,
Pan Ruikun,
Wang Kai,
Sun Xiao Wei
Publication year - 2018
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201706000
Subject(s) - materials science , perovskite (structure) , nanocrystal , halide , nanorod , full width at half maximum , nanoparticle , solvent , optoelectronics , chemical engineering , nanotechnology , analytical chemistry (journal) , inorganic chemistry , organic chemistry , chemistry , engineering
Abstract All inorganic cesium lead halide (CsPbX 3 , X = Cl, Br, I) perovskite nanocrystals (PeNCs) are synthesized by employing polar solvent controlled ionization (PCI) method in precursors. The new strategy can be easily carried out at room temperature and allow to employ smaller amount of weaker polarity and a broader range of low‐boiling low‐toxic solvents. The as prepared CsPbX 3 PeNCs reveal tunable emission spectra from 380 to 700 nm and high quantum yields over 80% with narrow full width at half maximum (FWHM). Meanwhile, larger “effective Stokes shifts” of PeNCs in PCI method, which enlarges 200% more than other PeNCs in regular methods, are observed. Most interestingly, the PeNCs growth process is coupling with some typical crystals formations. The main morphologies of CsPbI 3 PeNCs are hybrid of nanorods and nanoparticles. The primary morphologies of CsPbBr x I 3‐ x and CsPbBr 3 PeNCs are nanowires, which are supposed to have great potentials for applying in laser arrays and highly sensitive photodetector applications. Furthermore, such superior optical is endowed to fabricate white light emitting diodes, which has wide color gamut covering up to 120% of the National Television Systems Committee color standard.