title: High-temperature luminescence quenching of colloidal quantum dots.
abstract: Thermal quenching of quantum dot (QD) luminescence is important for application in luminescent devices. Systematic studies of the quenching behavior above 300 K are, however, lacking. Here, high-temperature (300-500 K) luminescence studies are reported for highly efficient CdSe core-shell quantum dots (QDs), aimed at obtaining insight into temperature quenching of QD emission. Through thermal cycling (yoyo) experiments for QDs in polymer matrices, reversible and irreversible luminescence quenching processes can be distinguished. For a variety of core-shell systems, reversible quenching is observed in a similar temperature range, between 100 and 180 °C. The irreversible quenching behavior varies between different systems. Mechanisms for thermal quenching are discussed.
authors.affiliation: Condensed Matter and Interfaces, Debye Institute for Nanomaterials Science, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands.
authors.forename: Yiming
authors.initials: Y
authors.lastname: Zhao
authors.forename: Charl
authors.initials: C
authors.lastname: Riemersma
authors.forename: Francesca
authors.initials: F
authors.lastname: Pietra
authors.forename: Rolf
authors.initials: R
authors.lastname: Koole
authors.forename: Celso de Mello
authors.initials: Cde M
authors.lastname: Donegá
authors.forename: Andries
authors.initials: A
authors.lastname: Meijerink
mesh_terms: D003102:Colloids / Q000737:chemistry*; D006358:Hot Temperature; D008163:Luminescent Measurements / Q000379:methods*; D008422:Materials Testing; D045663:Quantum Dots
chemical_list: D003102:Colloids