Regensburg 2019 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 36: II-VI- and III-V-semiconductors
HL 36.11: Vortrag
Donnerstag, 4. April 2019, 12:15–12:30, H31
Colloidal InP-based Quantum Dot Emitters: Limiting Factors for Color Purity — •Michael Binder1, Alexander F. Richter1, Alexander S. Urban2, Itai Lieberman3, Thomas Eberle3, and Jochen Feldmann1 — 1Chair for Photonics and Optoelectronics, LMU München — 2Nanospectroscopy Group, LMU München — 3Merck KGaA, Darmstadt
Colloidal quantum dots (cQDs) with an InP-based core/shell structure are promising for light emitting applications as non-toxic alternatives to colloidal cadmium-based QDs. Up to now it is still a challenge to compete with the narrower emission bandwidth of Cd-cQDs which is needed for high color purity in applications such as displays. Here, we investigate the nature of photoluminescence (PL) peak broadening by means of single cQD spectroscopy. It turns out that the PL bandwidth of individual InP-based cQDs is comparable to their Cd-based counterparts. Therefore broadening of the ensemble emission bandwidth can only be attributed to larger size-inhomogeneity. The latter is also responsible for non-radiative energy transfer between closely-spaced cQDs which red-shifts the ensemble PL peak. This effect can be dynamically followed in the spectrally resolved PL-decay. Altogether we conclude that there are no intrinsic drawbacks for InP cQDs regarding color purity of a light emitting device as compared to Cd-based cQDs.