Size dependence of upconversion photoluminescence in MPA capped CdTe quantum dots: Existence of upconversion bright point

The photoluminescence (PL) from semiconductor quantum dots can show a “PL bright point”, that is the PL from as prepared quantum dots is maximum at a particular size. In this work we show that, for CdTe quantum dots, upconversion photoluminescence (UCPL) originating from nonlinear absorption shows a...

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Bibliographic Details
Published in:Journal of luminescence 2016-01, Vol.169, p.308-312
Main Authors: Ananthakumar, S., Jayabalan, J., Singh, Asha, Khan, Salahuddin, Babu, S. Moorthy, Chari, Rama
Format: Article
Language:English
Subjects:
Photoluminescence
Quantum dots
Two-photon excitation
Upconversion luminescence
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Summary:The photoluminescence (PL) from semiconductor quantum dots can show a “PL bright point”, that is the PL from as prepared quantum dots is maximum at a particular size. In this work we show that, for CdTe quantum dots, upconversion photoluminescence (UCPL) originating from nonlinear absorption shows a similar “UCPL bright point”. The PL and UCPL bright points occur at nearly the same size. The existence of a UCPL bright point has important implications for upconversion microscopy applications. •The size dependence of the upconversion photoluminescence (UCPL) spectrum of CdTe quantum dots has been reported.•We show that the UCPL from the CdTe quantum dots is highest at a particular size.•Thus the occurrence of a "UCPL bright point" in CdTe quantum dots has been demonstrated.•It has been shown that the UCPL bright point occurs at nearly the same size as a normal bright point.
ISSN:0022-2313
1872-7883
DOI:10.1016/j.jlumin.2015.09.019