Influence of the second shell layer (TOPO, HDA) on the optical properties of CdSe/ZnS nanocrystal powder

• Autorzy: Zatryb G. , Podhorodecki A. , Misiewicz J. , Nauka K.
• Języki publikacji: EN

Abstrakty

EN

CdSe/ZnS nanocrystal powder covered with an additional cap layer (II-shell) of hexadecylamine (HDA) or tri-n-octylphosphine oxide (TOPO) has been investigated by using photoluminescence (PL) and total photoluminescence excitation (TPLE) spectroscopy. Depending on II-shell composition, different emission properties of the system have been observed. Strong emission bands at 2.00 eV and 1.95 eV related to nanocrystalline CdSe core recombination have been observed for TOPO and HDA-CdSe/ZnS nanocrystals, respectively. In both cases, weak emission bands centered at 3.5 and 2.8 eV have also been found. Moreover, in the case of TOPO II-shell, emission band at 1.65 eV related to defect state recombination has been observed. In both cases, similar absorption properties have been found, indicating that II-shell composition does not change nanocrystal absorption properties in an efficient way.

Słowa kluczowe

EN

nanocrystals; photoluminescence; CdSe/ZnS; HAD; TOPO

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Optica Applicata
• Rocznik: 2007
• Tom: Vol. 37, nr 4
• Strony: 459--464
• Opis fizyczny: Bibliogr. 20 poz.

Twórcy

autor

Zatryb G.

autor

Podhorodecki A.

autor

Misiewicz J.

autor

Nauka K.

• Institute of Physics, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland

Bibliografia

• [1] ALIVISATOS A.P., Semiconductor clusters, nanocrystals, and quantum dots, Science 271(5251), 1996, pp. 933–7.
• [2] BRUS L.E., Quantum crystallites and nonlinear optics, Applied Physics A: Materials Science and Processing 53(6), 1991, pp. 465–74.
• [3] MURRAY C.B., NORRIS D.J., BAWENDI M.G., Synthesis and characterization of nearly monodisperse CdE (E = sulfur, selenium, tellurium) semiconductor nanocrystallites, Journal of the American Chemical Society 115(19), 1993, pp. 8706–15.
• [4] BOWEN KATARI J.E., COLVIN V.L., ALIVISATOS A.P., X-ray photoelectron spectroscopy of CdSe nanocrystals with applications to studies of the nanocrystal surface, Journal of Physical Chemistry 98(15), 1994, pp. 4109–17.
• [5] PENG X., WICKHAM J., ALIVISATOS A.P., Kinetics of II–VI and III–V colloidal semiconductor nanocrystal growth: “Focusing” of size distributions, Journal of the American Chemical Society 120(21), 1998, pp. 5343–4.
• [6] CHAN W.C.W., NIE S., Quantum dot bioconjugates for ultrasensitive nonisotopic detection, Science 281(5385), 1998, pp. 2016–8.
• [7] SANTORI C., PELTON M., SOLOMON G., DALE Y., YAMAMOTO Y., Triggered single photons from a quantum dot, Physical Review Letters 86(8), 2001, pp. 1502–5.
• [8] MICHLER P., IMAMOGLU A., MASON M.D., CARSON P.J., STROUSE G.F., BURATTO S.K., Quantum correlation among photons from a single quantum dot at room temperature, Nature 406(6799), 2000, pp. 968–70.
• [9] DOMARADZKI J., KACZMAREK D., PROCIOW E.L., BORKOWSKA A., SCHMEISSER D., BEUCKERT G., Microstructure and optical properties of TiO2 thin films prepared by low pressure hot target reactive magnetron sputtering, Thin Solid Films 513(1–2), 2006, pp. 269–74.
• [10] SCHLAMP M.C., PENG X.G., ALIVISATOS A.P., Improved efficiencies in light emitting diodes made with CdSe(CdS) core/shell type nanocrystals and a semiconducting polymer, Journal of Applied Physics 82(11), 1997, pp. 5837–42.
• [11] NIRMAL M., DABBOUSI B.O., BAWENDI M.G., MACKLIN J.J., TRAUTMAN J.K., HARRIS T.D., BRUS L.E., Fluorescence intermittency in single cadmium selenide nanocrystals, Nature 383(6603), 1996, pp. 802–4.
• [12] EMPEDOCLES S.A., BAWENDI M.G., Quantum-confined Stark effect in single CdSe nanocrystallite quantum dots, Science 278(5346), 1997, pp. 2114–7.
• [13] FIRTH A.V., COLE-HAMILTON D.J., ALLEN J.W., Optical properties of CdSe nanocrystals in a polymer matrix, Applied Physics Letters 75(20), 1999, pp. 3120–2.
• [14] SCHLEGEL G., BOHNENBERGER J., POTAPOVA I., MEWS A., Fluorescence decay time of single semiconductor nanocrystals, Physical Review Letters 88(13), 2002, pp. 137401/1–4.
• [15] EBENSTEIN Y., MOKARI T., BANIN U., Fluorescence quantum yield of CdSe/ZnS nanocrystals investigated by correlated atomic-force and single-particle fluorescence microscopy, Applied Physics Letters 80(21), 2002, pp. 4033–5.
• [16] KUNO M., FROMM D.P., JOHNSON S.T., GALLAGHER A., NESBITT D.J., Modeling distributed kinetics in isolated semiconductor quantum dots, Physical Review B: Condensed Matter and Materials Physics 67(12), 2003, pp. 125304/1–15.
• [17] BLANTON S.A., HINES M.A., GUYOT-SIONNEST P., Photoluminescence wandering in single CdSe nanocrystals, Applied Physics Letters 69(25), 1996, pp. 3905–7.
• [18] EMPEDOCLES S.A., NORRIS D.J., BAWENDI M.G., Photoluminescence spectroscopy of single CdSe nanocrystallite quantum dots, Physical Review Letters 77(18), 1996, pp. 3873–6.
• [19] NURMIKKO A.V., GUNSHOR R.L., Optical properties and device prospects of ZnSe-based quantum structures, Journal of Luminescence 52(1–4), 1992, pp. 89–108.
• [20] PODHORODECKI A., MISIEWICZ J., NAUKA K., Photoluminescence and photoluminescence excitation spectroscopy of CdSe/ZnS core-shell free standing nanocrystals in the ultraviolet spectral range, Physica Status Solidi C 3(11), 2006, pp. 3836–9.