Organometallic halide perovskite quantum dots (OHP-QDs) have attracted a great deal of attention because of their high photoluminescence quantum yields (PLQYs, up to 90%) and narrow-band colors. However, precise control of the OHP-QDs' size is difficult and they are unstable under ambient conditions, which limits their usage in applications such as lasers and displays. Herein, we introduce a novel method to prepare size-controllable and stable OHP (methylammonium lead trihalide, MAPbX3, where X = Cl, Br, and I)-QDs/polymer films using polydimethylsiloxane (PDMS) as a template. The MAPbX3 QDs/PDMS films developed in this work are self-standing, flexible, transparent, and retain the photophysical properties of OHP-QDs for at least several months. Moreover, the uniform size of the OHP-QDs results in narrow photoluminescence (PL) emission (full-width-at-half-maximum, FWHM ≈ 20 nm) compared to that of QDs synthesized by a conventional method (≈50 nm). The PL emission peak can be shifted by varying the size of the QDs and also by changing the halide component (Cl, Br, and I), covering a wide range of absorption wavelengths. Furthermore, the higher PL intensity of the larger QDs was confirmed by time-correlated single photon counting (TCSPC) experiments.
Bibliographical noteFunding Information:
This research was supported by the MSIP (Ministry of Science, ICT and Future Planning), Korea, under the "ICT Consilience Creative Program" (IITP-2017-2017-0-01015) supervised by the IITP (Institute for Information & Communications Technology Promotion). This work was also supported by a National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIP) (No. 2016R1C1B1009709), and a TJ Park Science Fellowship of the POSCO TJ Park Foundation.
All Science Journal Classification (ASJC) codes
- Materials Chemistry