Journal
ADVANCED MATERIALS
Volume 30, Issue 20, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201706592
Keywords
luminescence; nanoplates; quantum dots; Sn perovskites
Categories
Funding
- Ministry of Science and Technology of Taiwan [MOST 104-2119-M-002-005, MOST 105-2119-M-002-003, MOST106-2119-M-002-031, MOST 106-2119-M-002-003]
- National Taiwan University [NTU-CESRP-104R7619]
Ask authors/readers for more resources
Colloidal perovskite quantum dots represent one of the most promising materials for applications in solar cells and photoluminescences. These devices require a low density of crystal defects and a high yield of photogenerated carriers, which are difficult to realize in tin-halide perovskite because of the intrinsic instability of tin during nucleation. Here, an enhancement in the luminescent property of tin-halide perovskite nanoplates (TPNPs) that are composed of strongly coupled layered structures with the chemical formula of PEA(2)SnX(4) (PEA = C6H5(CH2)(2)NH3, X = Br, I) is reported. TPNPs (X = I) show an emission at a wavelength of 640 nm, with high quantum yield of 6.40 +/- 0.14% and full width at half maximum (FWHM) as small as 36 nm. The presence of aliphatic carboxylic acid is found to play a key role in reducing the tin perovskite defect density, which significantly improves the emission intensity and stability of TPNPs. Upon mixing iodo- and bromo-precursors, the emission wavelength is successfully tuned from 640 nm (PEA(2)SnI(4)) to 550 nm (PEA(2)SnBr(4)), with a corresponding emission quantum yield and FWHM of 0.16-6.40% and 36-80 nm, respectively. The results demonstrate a major advance for the emission yield and tunability of tin-halide perovskites.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available