中文 |
中文

Newsroom

Home / Newsroom / Research News / Chemistry

Cu+ Doping Enhances Self-trapped Exciton Emission in Alloyed Cs2(Ag/Na)InCl6 Double Perovskite

Mar 28, 2022

All-inorganic 3D lead-free double perovskites (DPs) with broadband self-trapped exciton (STE) emission have shown great promise as alternatives to lead halide perovskites in various optoelectronic applications such as light-emitting diodes (LEDs) and photodetectors. Fundamental understanding the effect of doping on the optical properties of DPs especially the STE dynamics is of vital importance for their performance optimization and applications.
In a study published in Advanced Science, the research group led by Prof. CHEN Xueyuan from Fujian Institute of Research on the Structure of Matter of the Chinese Academy of Sciences developed a unique strategy via Cu+ doping to achieve efficient STE emission in the alloyed lead-free Cs2(Ag/Na)InCl6 DP crystals.

This unique strategy based on Cu+ doping boosts the STE emission in the alloyed Cs2(Ag/Na)InCl6 DPs. The researchers used a small amount (1.0 mol%) of Cu+ doping to realize the boosted STE emission in the crystals, with photoluminescence (PL) quantum yield increasing from 19.0% to 62.6% and excitation band shifting from 310 nm to 365 nm.

They comprehensively surveyed the effect of Cu+ doping on the electronic structure and optical properties of Cs2(Ag/Na)InCl6 and the STE dynamics. The as-synthesized Cs2(Ag/Na)InCl6: Cu+ crystals exhibit significantly enhanced PL stemming from the increased radiative recombination rate of STEs as well as the improved STE density.

By means of temperature-dependent PL and ultrafast femtosecond transient absorption spectroscopies, the researchers unraveled that the remarkable PL enhancement was ascribed to the increased density and radiative recombination rate of STEs, as a result of symmetry breakdown of the STE wavefunction at the octahedral Ag+ site induced by Cu+ doping.

Besides, the researchers demonstrated the excellent air, structural and thermal stability of these Cu+-doped Cs2(Ag/Na)InCl6 crystals, and revealed their great potentials as efficient yellow-emitting phosphors for application in near-ultraviolet (NUV)-converted white LEDs.

This study provides deep insights into the STE dynamics in Cu+-doped Cs2(Ag/Na)InCl6, thereby laying a foundation for future design of new lead-free DPs with efficient STE emission.

Contact

CHEN Xueyuan

Fujian Institute of Research on the Structure of Matter

E-mail:

Boosting the Self-Trapped Exciton Emission in Alloyed Cs2(Ag/Na)InCl6 Double Perovskite via Cu+ Doping

Related Articles
(a) SEM image of a single NR with Pt-electrodes deposited by focus ions beam deposition techniques. (b) I-V curves of PTCDA NR on SiO2 dielectric layer
Researchers Improve Photophysical and Electrical Properties of Organic Semiconductor Nanostructure
May 04, 2016

Researchers in High Magnetic Field Laboratory, Chinese Academy of Science (CHMFL) in Hefei prepared film and array-arranged single crystalline nanorod (NR) of perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA) by organic molecular beam deposition method, and investigat...

DICP Scientists reveal the photophysical mechanism of lead-free perovskite nanocrystals.jpg
DICP Scientists Reveal Lead-Free Perovskite Nanocrystals Photophysical Mechanism
Sep 11, 2017

Scientists HAN Keli et al. from Dalian Institute of Chemical Physics (DICP) of the Chinese Academy of Sciences (CAS), synthesized a new lead-free Cs3Bi2Br9 NCs and revealed the photophysical mechanism of it.The results were published in Angew. Chem. Int. Ed.

Contact Us

  • 86-10-68597521 (day)

    86-10-68597289 (night)

  • 52 Sanlihe Rd., Xicheng District,

    Beijing, China (100864)

Copyright © 2002 - Chinese Academy of Sciences