publication . Doctoral thesis . 2015

Doping the dots: doped quantum dots for luminescent solar concentrators

Eilers, J.J.;
Open Access English
  • Published: 26 Jan 2015
  • Publisher: Utrecht University
  • Country: Netherlands
Abstract
In this thesis, synthesis methods for luminescent organically capped colloidal ZnSe QDs of different sizes, ranging from 4.0 to 7.5 nm are reported. These QDs are analyzed using TEM, absorption spectroscopy, photoluminescence measurements and temperature dependent photoluminescence decay measurements. A similar trend is observed for the band-edge photoluminescence decay of all investigated sizes: the decay time is short (~5 ns) above 20 K and increases sharply below 20 K, eventually reaching a constant value (270 - 400 ns) at sufficiently low temperatures (< 4 K). The temperature regime in which the decrease of lifetime occurs depends on the QD size and is lower...
Subjects
free text keywords: Quantum-Dots, transition-metal-ions, lanthanides, luminescent-solar-concentrators, solar-energy, magic-size-nanocrystals, energy-transfer, acoustic-phonons, excited-state-dynamics
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Doctoral thesis . 2015
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1 Introduction 1 1.1 The energy problem . . . . . . . . . . . . . . . . . . . . . . 1 1.2 Solar Energy . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.3 Geometrical solar concentrators . . . . . . . . . . . . . . . . 6 1.4 Luminescent solar concentrators . . . . . . . . . . . . . . . 8 1.5 Luminescent materials . . . . . . . . . . . . . . . . . . . . . 15 1.5.1 Inorganic phosphors . . . . . . . . . . . . . . . . . . 17 1.5.2 Quantum Dots . . . . . . . . . . . . . . . . . . . . . 21 1.6 Outline of this thesis . . . . . . . . . . . . . . . . . . . . . . 32

2 Excited state dynamics in colloidal ZnSe quantum dots 39 2.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 2.2 Experimental Methods . . . . . . . . . . . . . . . . . . . . . 42 2.3 Results and Discussion . . . . . . . . . . . . . . . . . . . . . 45 2.4 Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

3 Luminescent Mn-Doped ZnSe Made by Cation-exchange 65 3.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 3.2 Experimental Methods . . . . . . . . . . . . . . . . . . . . . 67 3.3 Results and Discussion . . . . . . . . . . . . . . . . . . . . . 70 3.4 Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

4 Optical properties of Mn-doped ZnTe magic size nanocrystals 87 4.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 4.2 Experimental Methods . . . . . . . . . . . . . . . . . . . . . 89 4.3 Results and Discussion . . . . . . . . . . . . . . . . . . . . . 91 4.4 Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

5 Incorporation of luminescent Yb3+ ions into CdSe QDs 101 5.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . 102 5.2 Experimental Methods . . . . . . . . . . . . . . . . . . . . . 103 5.3 Results and Discussion . . . . . . . . . . . . . . . . . . . . . 106 5.3.1 Initial CdSe QDs . . . . . . . . . . . . . . . . . . . . 106 5.3.2 Incorporating Yb3+ . . . . . . . . . . . . . . . . . . 107 5.3.3 SILAR . . . . . . . . . . . . . . . . . . . . . . . . . . 119 5.4 Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . 123

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