Lead-free rare-earth-based double perovskite nanocrystals with near-infrared emission


NIR PL emission spectra and HRTEM pictures of Cs2NaEr0.5Sb0.5Cl6 NCs. Credit: HAN Peigeng and WU Ruixiang

Lead-free halide perovskite nanocrystals (NCs) with distinctive optical properties are promising in light-emitting diodes (LEDs), photodetectors, and solar cells.

Previous research primarily centered on the photoluminescence (PL) within the seen area, and people on the near-infrared (NIR) PL of lead-free perovskite NCs are uncommon.

In article ad

Recently, a analysis group led by Prof. Han Keli from the Dalian Institute of Chemical Physics (DICP) of the Chinese Academy of Sciences (CAS), in collaboration with Prof. Miao Xiangyang’s group from Shanxi Normal University, designed colloidal synthesis of all-inorganic rare-earth-based double perovskite NCs with NIR emission, and revealed their exciton dynamics.

This examine was revealed in Laser & Photonics Reviews on August 27.

The researchers synthesized all-inorganic rare-earth-based Cs2NaEr1-xBxCl6 (B: In, Sb, Bi; x = 0, 0.13, 0.5) double perovskite NCs by sizzling injection with variable temperature.

They discovered that each one these NCs exhibited a NIR PL emission from 4I13/2 → 4I15/2 transition of Er3+, and on account of the included Sb3+, Cs2NaEr0.5Sb0.5Cl6 NCs confirmed a 23-fold NIR PL enhancement with the common lifetime of 119.1 μs.

“The origin of NIR PL enhancement was attributed to the increase of exciton absorption, the longer PL lifetime, the suitable phonon-assisted process caused by the indirect band structure, and the process of long-lived dark trap state assisted NIR PL emission,” mentioned Prof. Han.

Scientists synthesize lead-free zirconium-based vacancy-ordered double perovskite nanocrystals

More info:
Ruixiang Wu et al, All‐Inorganic Rare‐Earth‐Based Double Perovskite Nanocrystals with Near‐Infrared Emission, Laser & Photonics Reviews (2021). DOI: 10.1002/lpor.202100218

Lead-free rare-earth-based double perovskite nanocrystals with near-infrared emission (2021, September 9)
retrieved 9 September 2021
from https://phys.org/news/2021-09-lead-free-rare-earth-based-perovskite-nanocrystals-near-infrared.html

This doc is topic to copyright. Apart from any honest dealing for the aim of personal examine or analysis, no
half could also be reproduced with out the written permission. The content material is supplied for info functions solely.

Source link

Leave a reply

Please enter your comment!
Please enter your name here