Skip to main content
Log in

Spectroscopic study of oscillator strength and radiative decay time of colloidal CdSe quantum dots

  • Published:
Optical and Quantum Electronics Aims and scope Submit manuscript

Abstract

Characterization of samples of cadmium selenide quantum dots (CdSe) QDs dissolved in toluene colloidal solutions at a concentration of 1.4 mg/ml was carried out through UV–Vis absorption and photoluminescence (PL) spectroscopy. The size-dependent absorption and red-shifted PL emission peak wavelengths could be tuned between 510–576 and 545–606 nm respectively. Optical absorption spectral measurements yielded CdSe QDs having diameters about ~ 2.44–3.69 nm with energy gaps 2.32–2.08 eV which are higher than the bulk CdSe (1.74 eV) reminiscent of quantum confinement. This is found to be in good agreement with the semi-empirical pseudopotential model. In addition, the first excitonic absorption transition 1S(e)1S3/2(h) oscillator strength and the corresponding fluorescence radiative decay time of CdSe QDs are assessed using relevant Einstein relations for absorption and emission in a two-level system. The elaborated calculations would anticipate that the transition oscillator scale with the CdSe QD radius as ~ R2.54. Correspondingly, the calculated radiative decay times decrease from 56.4 to 23.2 ns which scale with CdSe QDs radius as ~ R−2.155 in fairly good agreement with experimental values reported in the literature.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Fig. 7
Fig. 8

References

  • Ayelea, D.W., Suc, W.N., Chouc, H.L., Pana, C.J., Hwanga, B.J.: Composition-controlled optical properties of colloidal CdSe quantum dots. Appl. Surf. Sci. 322, 177–184 (2014)

    Article  ADS  Google Scholar 

  • Califano, M., Franceschetti, A., Zunger, A.: Temperature dependence of excitonic radiative decay in CdSe quantum dots: the role of surface hole traps. Nano Lett. 5(12), 2360–2364 (2005)

    Article  ADS  Google Scholar 

  • Chukwuocha, E.O., Onyeaju, M.C.: Effect of quantum confinement on the wavelength of CdSe, ZnS And GaAs quantum dots (Qds). Int. J. Sci. Technol. Res. 1, 21–24 (2012)

    Google Scholar 

  • Deng, D.W., Yu, J.S., Pan, Y.: Water-soluble CdSe and CdSe/CdS nanocrystals: a greener synthetic route. J. Colloid Interface Sci. 299, 225–232 (2006)

    Article  ADS  Google Scholar 

  • Donega, C.D.M., Hickey, S.G., Wuister, S.F., Vanmaekelbergh, D., Meijerink, A.: Single-step synthesis to control the photoluminescence quantum yield and size dispersion of CdSe nanocrystals. J. Phys. Chem. B 107, 489–496 (2003)

    Article  Google Scholar 

  • Eisler, H.J., Sundar, V.C., Bawendi, M.G., Walsh, M., Smith, H.I., Klimov, V.: Color-selective semiconductor nanocrystal laser. Appl. Phys. Lett. 80, 4614–4616 (2002)

    Article  ADS  Google Scholar 

  • Frecker, T., Bailey, D., Arzeta-Ferrer, X., McBride, J., Rosenthal, S.J.: Quantum dots and their application in lighting, displays, and biology. ECS J. Solid State Sci. Technol. 5, 3019–3031 (2016)

    Article  Google Scholar 

  • Gong, K., Zeng, Y., Kelley, D.F.: Extinction coefficients, oscillator strengths, and radiative lifetimes of CdSe, CdTe, and CdTe/CdSe nanocrystals. J. Phys. Chem. C 117, 20268–20279 (2013)

    Article  Google Scholar 

  • Gyori, Z., Tatrai, D., Sarlos, F., Szabo, G., Kukovecz, A., Konya, Z., Kiricsi, I.: Laser-induced fluorescence measurements on CdSe quantum dots. Process. Appl. Ceram. 4, 33–38 (2010)

    Article  Google Scholar 

  • Hamizi, N.A., Johan, M.R.: Optical properties of CdSe quantum dots via non-TOP based route. Int. J. Electrochem. Sci. 7, 8458–8467 (2012)

    Google Scholar 

  • Henderson, B., Imbusch, G.F.: Optical Spectroscopy of Inorganic Solids. Oxford University Press, Oxford (1989)

    Google Scholar 

  • Hoogland, S., Sukhovatkin, V., Howard, I., Cauchi, S., Levina, L., Sargent, E.H.: A solution-processed 1.53 μm quantum dot laser with temperature-invariant emission wavelength. Opt. Express 14, 3273–3281 (2006)

    Article  ADS  Google Scholar 

  • Huang, J., Xu, B., Yuan, C., Chen, H., Sun, J., Sun, L., Agren, H.: Improved performance of colloidal CdSe quantum dot-sensitized solar cells by hybrid passivation. ACS Appl. Mater. Interfaces. 6, 18808–18815 (2014)

    Article  Google Scholar 

  • Jha, P.P., Sionnest, P.G.: Photoluminescence switching of charged quantum dot films. J. Phys. Chem. C 111, 15440–15445 (2007)

    Article  Google Scholar 

  • Kim, J.Y., Hiramatsu, H., Osterloh, F.E.: Planar polarized light emission from CdSe nanoparticle clusters. J. Am. Chem. Soc. 127, 15556–15561 (2005)

    Article  Google Scholar 

  • Klimov, V.I.: Nanocrystal Quantum Dots, 2nd edn. CRC Press, Boca Raton (2010)

    Book  Google Scholar 

  • Konstantatos, G., Sargent, E.H.: Colloidal Quantum Dot Optoelectronics and Photovoltaics. Cambridge University Press, Cambridge (2013)

    Book  Google Scholar 

  • Langevin, M.A., Quirion, D.L., Ritcey, A.M., Allen, C.N.: Size-dependent extinction coefficients and transition energies of near-infrared β-Ag2Se colloidal quantum dots. J. Phys. Chem. C 117, 5424–5428 (2013)

    Article  Google Scholar 

  • Leatherdale, C.A., Woo, W.K., Mikulec, F.V., Bawendi, M.G.: On the absorption cross section of CdSe nanocrystal quantum dots. J. Phys. Chem. B 106, 7619–7622 (2002)

    Article  Google Scholar 

  • Li, J., Wang, L.W.: Shape effects on electronic states of nanocrystals. Nano Lett. 3, 1357–1363 (2003)

    Article  ADS  Google Scholar 

  • Li, Z., Sun, Q., Zhu, Y., Tan, B., Xu, Z., Xue, D.S.: Ultra-small fluorescent inorganic nanoparticles for bioimaging. J. Mater. Chem. B 2, 2793–2818 (2014)

    Article  Google Scholar 

  • Mahajan, S., Rani, M., Dubey, R.B., Mahajan, J.: Characteristics and properties of CdSe quantum dots. Int. J. Latest Res. Sci. Technol. 2, 457–459 (2013)

    Google Scholar 

  • Mi, W., Tian, J., Tian, W., Dai, J., Wang, X., Liu, X.: Temperature dependent synthesis and optical properties of CdSe quantum dots. Ceram. Int. 38, 5575–5583 (2012)

    Article  Google Scholar 

  • Murray, C.B., Norris, D.J., Bawendi, M.G.: Synthesis and characterization of nearly monodisperse CdE (E = sulfur, selenium, tellurium) semiconductor nanocrystallites. J. Am. Chem. Soc. 115, 8706–8715 (1993)

    Article  Google Scholar 

  • Nazzal, A., Fu, H.: Comparative theoretical study of the size dependent electronic and optical properties in CdS and CdSe spherical nanocrystals. J. Comput. Theor. Nanosci. 6, 1277–1289 (2009)

    Article  Google Scholar 

  • Norris, D.J., Efros, A.L., Rosen, M., Bawendi, M.G.: Size dependence of exciton fine structure in CdSe quantum dots. Phys. Rev. B 53, 16347–16354 (1996)

    Article  ADS  Google Scholar 

  • Pan, D., Wang, Q., Jiang, S., Ji, L., An, L.: Low-temperature synthesis of oil-soluble CdSe, CdS, and CdSe/CdS core–shell nanocrystals by using various water-soluble anion precursors. J. Phys. Chem. C 111, 5661–5666 (2007)

    Article  Google Scholar 

  • Petryayeva, E., Algar, W.R., Medintz, I.L.: Quantum dots in bioanalysis: a review of applications across various platforms for fluorescence spectroscopy and imaging. Appl. Spectrosc. 67, 215–251 (2013)

    Article  ADS  Google Scholar 

  • Rabani, E.: Structure and electrostatic properties of passivated CdSe nanocrystals. J. Chem. Phys. 115, 1493–1497 (2001)

    Article  ADS  Google Scholar 

  • Rogach, A.L., Gaponik, N., Lupton, J.M., Bertoni, C., Gallardo, D.E., Dunn, S., Pira, N.L., Paderi, M., Repetto, P., Romanov, S.G.: Light‐emitting diodes with semiconductor nanocrystals. Angew. Chem. Int. Ed. 47, 6538–6549 (2008)

    Article  Google Scholar 

  • Schdffner, M., Bao, X., Penzkofer, A.: Principal optical constants measurement of uniaxial crystal CdSe in the wavelength region between 380 and 950 nm. Appl. Opt. 31, 4546–4552 (1992)

    Article  ADS  Google Scholar 

  • Sole, J.G., Bausa, L.E., Jaque, D.: An Introduction to the Optical Spectroscopy of Inorganic Solids. Wiley, New York (2005)

    Book  Google Scholar 

  • Strekal, N.L: Size-dependent photoluminescence quantum yield of Cdse/Zns nanoparticles: Numerical simulation and experimental evidence. Nanosci. nanotechnol. 4, 16–21 (2014)

    Google Scholar 

  • Tauc, J.: Optical properties of amorphous semiconductor. In: Tauc, J. (ed.) Amorphous and Liquid Semiconductor. Plenum Publishing Company, New York (1973)

    Google Scholar 

  • Tauc, J., Menth, A.: States in the gap. J. Non-Cryst. Solids 8–10, 569–585 (1972)

    Article  Google Scholar 

  • Viswanatha, R., Sapra, S., Dasgupta, T.S., Sarma, D.D.: Electronic structure of and quantum size effect in III–V and II–VI semiconducting nanocrystals using a realistic tight binding approach. Phys. Rev. B 72, 045333-1–045333-10 (2005)

    Article  ADS  Google Scholar 

  • Wang, L.W., Zunger, A.: Electronic structure pseudopotential calculations of large (.apprx. 1000 atoms) si quantum dots. J. Phys. Chem. 98, 2158–2165 (1994)

    Article  Google Scholar 

  • Yu, W.W., Qu, L., Guo, W., Peng, X.: Experimental determination of the extinction coefficient of CdTe, CdSe, and CdS nanocrystals. Chem. Mater. 15, 2854–2860 (2003)

    Article  Google Scholar 

  • Yu, P., Beard, M.C., Ellingson, R.J., Ferrere, S., Curtis, C., Drexler, J., Luiszer, F., Nozik, A.J.: Absorption cross-section and related optical properties of colloidal InAs quantum dots. J. Phys. Chem. B 109, 7084–7087 (2005)

    Article  Google Scholar 

Download references

Acknowledgements

Authors are deeply grateful to members of the Nanotechnology Lab. at the National Institute of Laser Enhanced Sciences (NILES) and the esteemed staff of the solid-state Lab. at physics department, faculty of science, Cairo University.

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to Yahia Elbashar.

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Aboulfotouh, A., Fikry, M., Mohamed, M. et al. Spectroscopic study of oscillator strength and radiative decay time of colloidal CdSe quantum dots. Opt Quant Electron 50, 115 (2018). https://doi.org/10.1007/s11082-018-1375-6

Download citation

  • Received:

  • Accepted:

  • Published:

  • DOI: https://doi.org/10.1007/s11082-018-1375-6

Keywords

Navigation