Spectral behavior of plasmon enhanced fluorescence in organic-inorganic perovskite quantum dot solutions

• Published in: Physica scripta 2019-05, Vol.94 (5), p.55503
• Main Authors: Shakouri, Seyyedeh Mahdieh, Bagherzadeh-Khajehmarjan, Elnaz, Ahmadi-Kandjani, Sohrab
• Format: Article
• Language: English
• Subjects: Au nanoparticle; hybrid lead halide perovskite; localized surface plasmon resonance; plasmon enhanced fluorescence; quantum dot
• ISSN: 0031-8949; 1402-4896
• DOI: 10.1088/1402-4896/ab0571

In this work, the fluorescence emission of hybrid lead bromide perovskite quantum dots is enhanced with the assistance of surface plasmon resonance of gold nanoparticles. Due to the high sensitivity of these quantum dots to an aqueous environment, a water-free synthesis method is chosen for the synthesis of gold nanoparticles. Spherical gold nanoparticles, with a diameter of 13 nm and a surface plasmon resonance peak at 527 nm, are synthesized using oleylamine. CH3NH3PbBr3 perovskite quantum dots, with two different sizes, are also synthesized that show fluorescence emission peaks at 507 and 534 nm. Different concentrations of gold nanoparticles are added to the quantum dots solutions. For quantum dots with a fluorescence peak at a higher energy than localized surface plasmon resonance (LSPR) energy, quenching of fluorescence is observed. However, for quantum dots with a fluorescence peak slightly red-shifted, compared to LSPR, the fluorescence is enhanced by the factor of 2. This fluorescence enhancement is resulted by adding nanoparticles with concentration of 140 l. By further addition of nanoparticles, quenching of the emission is observed due to the reduction of the distances between the nanoparticles and the perovskite quantum dots.