6 December 2021

[Perovskite] – Lead-free rare-earth-based double perovskite nanocrystals with near-infrared emission.

Home > News > [Perovskite] – Lead-free rare-earth-based double perovskite nanocrystals with near-infrared emission.
Flèche contenu
Perovskite - Codex International

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

Previous studies mainly focused on the photoluminescence (PL) in the visible region, and those on the near-infrared (NIR) PL of lead-free perovskite NCs are rare.

Recently, a research 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.

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

They found that all these NCs exhibited a NIR PL emission from 4I13/24I15/2 transition of Er3+, and on account of the incorporated Sb3+, Cs2NaEr0.5Sb0.5Cl6 NCs showed a 23-fold NIR PL enhancement with the average 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,” said Prof. HAN.


Discover Also
[Perovskite] – Perovskite solar cells soar to new heights. 5 January 2022

In a joint effort between Pavia University (Italy) and the Center for Advancing Electronics Dresden at Technische Universität Dresden (Germany), researchers developed a novel method to fabricate lead halide perovskite solar cells with record efficiency – publication in the journal Science Advances

Read more
[Silicon] – How to turn ultrathin silicon black ? 5 January 2022

Silicon is the basic material that is used in our smart phones, in optical sensors, or in solar cells on our roofs. It is a major outstanding challenge that silicon absorbs incident light only weakly, especially in the red part of the visible spectrum.

Read more