Abstract
Reprecipitation synthesis has been demonstrated to be a simple and convenient route to fabricate high quality perovskite quantum dots toward display applications, whereas the limited chemical yields (< 10%) and difficulty of purification limited its further application. In order to overcome this issue, we here report a modified emulsion synthesis by introducing phase transfer strategy, which achieving effective extraction of newly formed perovskite quantum dots into non-polar solvent and avoiding the degradation of perovskite quantum dots to a large extent. Based on this strategy, gram-scale CH3NH3PbBr3 quantum dots were fabricated in 10 mL (~0.02 mol/L) colloidal solution with chemical yields larger than 70%. The as fabricated CH3NH3PbBr3 quantum dots exhibit an emission peak of 453 nm and a full width at half maximum of only 14 nm. Moreover, electroluminescent devices based on blue emitting CH3NH3PbBr3 quantum dots were also explored with a maximum luminance of 32 cd/m2, showing potential applications in blue light emitting devices.
Highlights
The development of lighting and display technologies demand luminescent materials with high color quality (Lin and Liu, 2011; Shirasaki et al, 2013; Pust et al, 2014)
The fabrication of blue emitting CH3NH3PbBr3 quantum dots (QDs) was based on the modification of our reported emulsion synthesis (Huang et al, 2015a)
CH3NH3PbBr3 QDs with average size of 2.4 nm were successfully fabricated via a modification of conventional emulsion synthesis process
Summary
The development of lighting and display technologies demand luminescent materials with high color quality (Lin and Liu, 2011; Shirasaki et al, 2013; Pust et al, 2014). In the past 3 years, halide perovskite quantum dots (QDs) have emerged as a new generation of luminescent materials with excellent photoluminescent (PL) properties such as high quantum yields (QYs), panchromatic wavelength tunability and narrow emission line width (Protesescu et al, 2015; Stranks and Snaith, 2015; Zhang et al, 2015), which make them promising candidates for wide color gamut displays (Bai and Zhong, 2015; Kim et al, 2016; Li et al, 2017) To further promote their potential commercialization applications, efficient mass production of colloidal perovskite QDs has become an important research topic (Huang H. et al, 2016; Xing et al, 2016; Ha et al, 2017; Zhang et al, 2017a). Further exploration of colloidal chemistry to overcome these issues is imperative
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