Modulating the emission of CsPbBr3 perovskite nanocrystals via thermally varying magnetic field of La0.67Sr0.33Mn0.9(Ni/Co)0.1O3

K Sandeep,C P Reshmi

doi:10.1063/1.5143930

Abstract

The role of the magnetic field in the emission properties of CsPbBr3 perovskite nanocrystals is investigated using magnetic materials, La0.67Sr0.33Mn0.9Co0.1O3 and La0.67Sr0.33Mn0.9Ni0.1O3. The ferromagnetic–paramagnetic phase transition point of these magnetic materials is near room temperature, and the intensity of the magnetic field can be controlled by changing the temperature. An increase of 51% and 33% is observed in the emission intensity of the CsPbBr3 perovskites, on increasing the temperature from 10 °C to 35 °C, in the presence of La0.67Sr0.33Mn0.9Ni0.1O3 and La0.67Sr0.33Mn0.9Co0.1O3, respectively. At lower temperatures, the samples are magnetic due to their ferromagnetic nature, and on increasing the temperature, they become non-magnetic. Magnetic materials as well as CsPbBr3 nanocrystals possess perovskite crystal structure, and this might be playing an important role in transmitting the magnetic field. By understanding the role of the magnetic field in the emission of CsPbBr3 perovskite nanocrystals, magnetic materials can be used to control the properties of CsPbBr3 nanocrystals for light energy harvesting and opto-electronic applications.

Highlights

Crystal structures of Ni/Co doped La0.67Sr0.33MnO3 and the CsPbBr3 nanocrystals are perovskite structures, and this can impart the magnetic field more effectively.[36–39]. By keeping all these things in mind, we investigate the role of the magnetic caloric effect of Ni/Co doped La0.67Sr0.33MnO3 in the emission properties of CsPbBr3 perovskite nanocrystals
The variation of the emission intensity of the CsPbBr3 perovskite nanocrystals in the presence of La0.67Sr0.33Mn0.9Co0.1O3 and La0.67Sr0.33Mn0.9Ni0.1O3 was investigated. These compounds have near room temperature ferromagnetic–paramagnetic phase transition points, and the intensity of the magnetic field can be controlled by varying the temperature
The emission intensity of the CsPbBr3 perovskites is found to increase by 51% in the case of Ni doped La0.67Sr0.33MnO3 and 33% in the presence of Co doped La0.67Sr0.33MnO3 on increasing the temperature from 10 ○C to 35 ○C

Summary

Introduction

CsPbBr3 perovskite nanocrystals have been recognized as a promising material for the fabrication of light harvesting and display devices, owing to their fascinating emission properties.[1,2,3,4,5,6] The unique features of CsPbBr3 perovskites include (i) broad and size dependent absorption, (ii) high extinction coefficient, (iii) narrow emission, and (iv) high photoluminescence and electroluminescence yield.[7,8,9,10,11,12,13,14,15] So far, lead halide perovskites are one of the known materials that displayed the highest efficiency for photovoltaics and light emitting diodes (LEDs).[11,16–25] Another advantage of the CsPbBr3 perovskites is the bandgap tunability by the halogen exchange reactions. We have used Ni/Co doped La0.67Sr0.33MnO3 for controlling the emission properties of CsPbBr3 perovskites.

Results

Conclusion