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Boosting self-trapped exciton emission from Cs3Cu2I5 nanocrystals by doping-enhanced exciton-phonon coupling.
- Source :
- Nano Research; Jul2023, Vol. 16 Issue 7, p10476-10482, 7p
- Publication Year :
- 2023
-
Abstract
- Self-trapped excitons (STEs) emission from halide perovskites with strong exciton-phonon coupling has attracted considerable attention due to the widespread application in optoelectronic devices. Nevertheless, the in-depth understanding of the relationship between exciton-phonon coupling and luminescence intensity remains incomplete. Herein, a doping-enhanced exciton-phonon coupling effect is observed in Cs<subscript>3</subscript>Cu<subscript>2</subscript>I<subscript>5</subscript> nanocrystals (NCs), which leads to a remarkable increasement of their STEs emission efficiency. Mechanism study shows that the hetero-valent substitution of Cu<superscript>+</superscript> with alkaline-earth metal ions (AE<superscript>2+</superscript>) causes a greater degree of Jahn–Teller distortion between the ground state and excited state structures of [Cu<subscript>2</subscript>I<subscript>5</subscript>]<superscript>3−</superscript> clusters as evidenced by our spectral analysis and first-principles calculations. As a consequence, an X-ray detector based on these Cs<subscript>3</subscript>Cu<subscript>2</subscript>I<subscript>5</subscript>:AE NCs delivers an X-ray imaging resolution of up to 10 lp·mm<superscript>−1</superscript> and a low detection limit of 0.37 µGy<subscript>air</subscript>·s<superscript>−1</superscript>, disclosing the potential of doping-enhanced exciton-phonon coupling effect in improving STEs-emission and practical application for X-ray imaging. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 19980124
- Volume :
- 16
- Issue :
- 7
- Database :
- Complementary Index
- Journal :
- Nano Research
- Publication Type :
- Academic Journal
- Accession number :
- 169750810
- Full Text :
- https://doi.org/10.1007/s12274-023-5708-9