Abstract
Hybrid organic–inorganic metal halide perovskite nanocrystals (NCs) are among the candidates for color conversion materials in displays, especially in NC-based micro-light-emitting diode (micro-LED) displays. However, these NCs are still lacking long-term stability, which has hindered their large-scale applications. We mimic the working conditions, which include ultraviolet light illumination at 323 K and three different types of atmosphere (N2, vacuum, and air), respectively, to investigate the stability of CH3NH3PbBr3 NCs embedded in the polyvinylidene fluoride matrix. X-ray diffraction results indicate the generation of NH4Pb2Br5, which is produced from the encapsulated CH3NH3PbBr3 NCs in all three atmospheres, and the decomposition generates a large amount of accompanying interface defects at the surface area of NCs, resulting in the significant decrease of the photoluminescence (PL) intensity. This work highlights the stability-related mechanism of CH3NH3PbBr3 NCs under combined external stresses that mimic operating conditions. In addition, this work also suggests a new method for conducting aging tests and contributes to developing effective routes towards higher stability of perovskite NCs.
Highlights
Hybrid organic-inorganic perovskites (HOIPs) have attracted great interest because they exhibit unique optical properties when functioning as luminescent materials for optoelectronic devices [1,2,3,4]
HOIP NCs can be synthesized in facile and low-cost manners, such as the solution-processing method to obtain perovskite nanocrystals embedded in a polymer matrix [5]
HOIP NCs serve as photon energy down conversion materials, transforming the blue light emitted from the InGaN light-emitting diodes (LEDs), or ultraviolet (UV) light from the AlGaN LEDs, into lower-energy emissions
Summary
Hybrid organic-inorganic perovskites (HOIPs) have attracted great interest because they exhibit unique optical properties when functioning as luminescent materials for optoelectronic devices [1,2,3,4]. HOIP NCs can be synthesized in facile and low-cost manners, such as the solution-processing method to obtain perovskite nanocrystals embedded in a polymer matrix [5] These two advantages make HOIP NCs highly promising in display and solid-state lighting applications by offering a wide color gamut or high color-rendering index [1,6,7]. In these applications, HOIP NCs serve as photon energy down conversion materials, transforming the blue light emitted from the InGaN light-emitting diodes (LEDs), or ultraviolet (UV) light from the AlGaN LEDs, into lower-energy emissions. Investigating the fundamental instability mechanisms of HOIP NCs and uncovering the origin of the instability are of paramount importance [4]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
