The role of fumed silica and PMMA in modifying the optical properties of blue-emitting CH3NH3PbBr3 perovskite nanocrystals
Auliya Rahmatul Ummah(a,b*), Ea Cahya Septia Mahen(d), Ferry Iskandar(c)

a) Theoretical and Material Physics Labpratory, Department of Physics, Mathematics and Natural Science, Mulawarman University, Jl. Barong Tongkok No. 4, Samarinda, Kalimantan Timur, 75123
b) Electronics and Instrumentation Laboratory, Department of Physics, Mathematics and Natural Science, Mulawarman University, Jl. Barong Tongkok No. 4, Samarinda, Kalimantan Timur, 75123
*auliyarahmatul.ummah[at]gmail.com
c) Department of Physics, Institut Teknologi Bandung, Bandung, Indonesia
d) Department of Physics, UIN Sunan Gunung Djati, Bandung, Indonesia

Abstract

The fabrication of highly efficient blue organic-inorganic halide perovskite (OIHP) with superior optical characteristics has posed considerable challenges and continues to be a focal point of research. In this paper, we report the successful synthesis of blue-emitting CH3NH3PbBr3 perovskite via a ligand-assisted reprecipitation process, followed by embedding within a matrix of fumed silica and poly-methylmethacrylate (PMMA). The incorporation of fumed silica led to a blue shift in the photoluminescence (PL) peak spectrum of CH3NH3PbBr3 from 481 nm to 477 nm. Additionally, after embedding in the PMMA matrix, the OIHP showed a further blue shift from 477 nm to 471 nm. The OIHP absorbance spectrum shifted from 451 nm to 426 nm, aligning with the observed blue shift in the PL spectrum. The emergence of two peaks in the absorbance spectrum suggests the growth of nanoparticles with a narrow size distribution, indicating a strong quantum confinement effect. These findings highlight that CH3NH3PbBr3/SiO2-PMMA composite films possess remarkable optical properties, making them promising for future optoelectronic applications.

Keywords: Perovskite Nanocrystals- Optical Properties- Fumed Silica- PMMA

Topic: Physics