Antiquenching Luminescence Temperature Antiquenching of the Luminescence from Capped CdSe Quantum Dots** Sander F. Wuister, Arie van Houselt, Celso de Mello Donegµ, Danil Vanmaekelbergh, and Andries Meijerink* Their efficient and tunable luminescence make semiconduc- tor quantum dots (QDs) very promising for application in optoelectronic devices and as luminescent labels. [1–3] Surface passivation with aliphatic capping molecules, such as trioctyl- phosphane (TOP), trioctylphosphaneoxide (TOPO) and hexadecylamine (HDA), plays a crucial role in obtaining luminescence quantum yields close to unity. [4, 5] Herein we demonstrate that the quantum yield of efficient TOP/TOPO/ HDA-capped CdSe QDs gradually decreases above 20 K but [*] S. F. Wuister, A. van Houselt, Dr. C. de Mello Donegµ, Prof. Dr. D. Vanmaekelbergh, Prof. Dr. A. Meijerink Chemistry and Physics of Condensed Matter Debye Institute, Utrecht University Princetonplein 5, 3584 CC Utrecht (The Netherlands) Fax: (+ 31) 30-253-2403 E-mail: a.meijerink@phys.uu.nl [**] This work was financially supported by Utrecht University within the Breedte-strategie program “Physics of Colloidal Matter”. The authors acknowledge insightful discussions with Dr. P. Guyot- Sionnest of the James Frank Institute, University of Chicago. Prof. J. J. Kelly is acknowledged for carefully reading the manuscript. Supporting information for this article is available on the WWW under http://www.angewandte.org or from the author. Angewandte Chemie 3029 Angew. Chem. Int. Ed. 2004, 43, 3029 –3033 DOI: 10.1002/anie.200353532 # 2004 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim