Luminescent disordered nanostructures: synthesis and characterization of CdSe nano-agglomerates

doi:10.1007/s12200-018-0822-0

Front. Optoelectron.

2018, Vol. 11

Issue (4) : 385-393 https://doi.org/10.1007/s12200-018-0822-0

RESEARCH ARTICLE

Luminescent disordered nanostructures: synthesis and characterization of CdSe nano-agglomerates

Ruiqing HU, Yifeng SHI, Haifeng BAO(

)

School of Material Science and Engineering, Wuhan Textile University, Wuhan 430200, China

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Abstract

A disorderly nanostructured CdSe nano-agglomerates (NAs) with tunable emission are synthesized in aqueous solution. Although the CdSe NAs have diameters of about 20 nm that are larger than the Bohr radius of the crystal bulk, they show size-dependent emission similar to the CdSe nanocrystals. The CdSe NAs represent a collective energy state based on Anderson localization.

Keywords nano-agglomerates CdSe photoluminescence

Corresponding Author(s): Haifeng BAO

Just Accepted Date: 07 June 2018 Online First Date: 07 August 2018 Issue Date: 21 December 2018

Cite this article:

Ruiqing HU,Yifeng SHI,Haifeng BAO. Luminescent disordered nanostructures: synthesis and characterization of CdSe nano-agglomerates[J]. Front. Optoelectron., 2018, 11(4): 385-393.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-018-0822-0
https://academic.hep.com.cn/foe/EN/Y2018/V11/I4/385

Fig.1 Typical TEM images of as-prepared CdSe NAs (a, b, c) with ED pattern shown in the inset of (c), the size and corresponding PL of (a), (b), (c) is 17 nm (520 nm), 22 nm (581 nm), 25 nm (630 nm), respectively. The inset pictures also show size-dependent change of the PL color of colloidal solutions of CdSe NAs upon UV-excitation (365 nm)

Fig.2 XPS spectra (up) and the WAXD diffractograms (down) of CdSe NAs, which the PL emission peak is 596 nm (a) and 532 nm (b)

Fig.3 Schematic model for the formation of CdSe NAs. I, pH= 10, 100°C; II, CdSe cluster coagulated to form NAs

Fig.4 (a) Temporal evolution of the absorption spectra of the CdSe NAs. (b) Enhancement of PL intensity upon aging at room temperature every 24 h (from the bottom up), l_ex = 390 nm. (c) Room temperature PL and PLE spectra of CdSe NAs ( 17 nm (green), 22 nm (yellow) and 25 nm (orange)). (D) For a CdSe NAs sample, (l_ex = 337 nm, l_em = 566 nm), the PL decayed with a lifetime of 8.4 ns. The PL decay is fitted exponentially. Here, ex, excitation spectrum; em, emission spectrum

Fig.5 (a) Mott-CFO model proposed for density of states in bulk disordered semiconductor, the localized states which are shown shaded are separated from the non-localized states by mobility edges in the conduction band (E_C) and the valance band (E_V). (b) In the case of nanoscale disordered semiconductor, the localized states become discrete because of quantum confinement; upon photo-excitation an electron transmit from the highest occupied localized state to the unoccupied localized states, and the recombination lead to a photon emission. E_F is the Fermi energy level

Fig.6 Typical TEM images of the as-prepared dispersive NAs (a) and NAs mass (b), the ED patterns of them show notable difference (c is the dispersive NAs and d is the NAs mass)

Fig.7 Room temperature UV-Vis absorption spectra (a), PL and PLE spectra (b) and PL lifetime (c) of four samples, which are dispersive NAs (black line), added ligand PTBT and heated for 1 h (red line), 4 h (green line) and 26 h (blue line), respectively. All the samples are in aqueous solution, and the PL lifetimes are recorded at 566 nm (l_ex = 337 nm). The last image is size-dependent change of the photoluminescence color of CdSe NAs mass deposited in the cavities on glass slide upon UV- excitation (365 nm)

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