Position Effects of Metal Nanoparticles on the Performance of Perovskite Light-Emitting Diodes.

Chen-Min Yang,Fang-Chung Chen

doi:10.3390/nano11040993

Abstract

Metal nanoparticles have been widely used for improving the efficiencies of many optoelectronic devices. Herein, position effects of gold nanoparticles (Au NPs) on the performance of perovskite light-emitting diodes (PeLEDs) are investigated. Amphiphilic Au NPs are synthesized so that they can be incorporated into different layers of the PeLEDs to enhance device efficiencies. The photoluminescent (PL) studies indicate apparent position effects; the strongest PL intensity occurs when the NPs are directly blended with the light-emitting perovskite layer. In contrast, the PeLEDs exhibit the highest luminance efficiency while the Au NPs are placed in the hole-transporting layer. The direct blending of the NPs in the perovskite layer might affect the electrical properties, resulting in inferior device performance. The results reported herein can help to understand the enhancing mechanism of the PeLEDs and may also lead to even better efficiencies in the near future.

Highlights

Nanomaterials 2021, 11, 993. https://Organic–inorganic hybrid perovskite materials are receiving increasing attention for many optoelectronic applications because of their advantageous properties, including high absorption coefficients, high carrier mobilities, solution processability and low material costs [1,2,3,4]
The perovskite light-emitting diodes (PeLEDs) were fabricated on indium–tin–oxide (ITO)-coated glass substrates; Figure 1a displays the device structure
The PeLEDs were fabricated on indium–tin–oxide (ITO)-coated glass substrates [18,19]

Summary

Introduction

Nanomaterials 2021, 11, 993. https://Organic–inorganic hybrid perovskite materials are receiving increasing attention for many optoelectronic applications because of their advantageous properties, including high absorption coefficients, high carrier mobilities, solution processability and low material costs [1,2,3,4]. The device efficiency of the earliest perovskite light-emitting diodes (PeLEDs) was very low, and the electroluminescence (EL) could only be observed at liquid nitrogen temperatures [13]. External quantum efficiencies (EQEs) over 20% have been reported [14]. Their EQEs are still lower than those of inorganic LEDs and organic light-emitting diodes. Among the proposed strategies for improving the device EQEs of PeLEDs, the use of plasmonic nanostructures has been considered a promising method [8]. Ag nanorods were incorporated into the hole-transporting layers of CsPbBr3 -based PeLEDs to improve the device efficiencies in 2017 [15].

Methods

Results

Conclusion