In the past few decades, trap emission was always believed hardly manipulated to luminescent quantum dots (QDs). Actually, not all trap emissions are useless. This work shows that the interface between MnSe dopant and ZnSe host could be used for manipulating irradiative defects with a controllable manner. This study focuses on three basic challenges for manipulating interface defects, including (i) how to introduce irradiative defects at the dopanthost interface, (ii) how to control the intensity of the interface trap emission, and (iii) how to tune QD emission color via the interface trap emission. Finally, this study shows the application of dopant-host interface defects in ratiometric optical thermometry.
In this work, we used Ag- and Mn-doped ZnInS/ZnS quantum dots (QDs) acting as a new generation of nontoxic dual-emission QDs with simultaneous tunable emission wavelengths and dual-emission ratiometric, which makes nontoxic dual-emission QDs with broad zone tunability in the color coordinate. The Ag-doped ZnInS ternary QDs can give rise to largely tunable emission wavelengths from 497 nm to 631 nm. The ratiometric of Ag and Mn dual emissions can be tuned by controlling Ag–Mn and Mn–Mn dopant coupling. With increased Mn doping amount, the increased Ag–Mn dopant coupling leads to increased Mn emission at the expense of lowered Ag emission and Ag fluorescence lifetime. The Mn–Mn coupling can be controlled by using different doping manners: co-doping Ag and Mn in ZnInS core or separate-doping Ag in ZnInS core and Mn in ZnS shell. Compared with co-doping, separate doping has weaker Mn–Mn interactions, an increased Mn irradiative recombination rate constant, and bright Mn photoluminescence.
Morphology engineering is a decisive factor for the optoelectronic properties of nanocrystals. Differing from morphologies with a solid interior, ring-like structures have a unique internal space which is not only available for loading chemicals, but also useful for controlling the field distribution. Herein, the perovskite array family welcomes a new member - CsPbBr3 ring arrays. This work solves several fundamental problems for fabricating CsPbBr3 ring arrays: (i) developing a simple method using 2D colloidal crystal templates to achieve ring arrays of CsPbBr3, (ii) finding two ways, say changing the template size or annealing of the template, to accurately tune the ring size of the array in a wide range from 2.6 μm to 16.9 μm, and (iii) investigating the dynamics of perovskite rings, which indicates a shrinking process towards the template spheres before the crystallization of the perovskites. Finally, the application of CsPbBr3 perovskite ring arrays to the field of lasers is shown.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.