Mesoscopically Structured Ionic Materials: RTIL Thin Films and Perovskite White Light Emitters
Abstract
Room temperature ionic liquids (ILs) are a vast class of liquids composed of complex cations and anions that are liquid salts at room temperature. They have unusual properties that can be finely tuned for a wide variety of applications. The role that interfaces play in the dynamics of liquids is a fundamental scientific problem with vast importance in technological applications. The prior first observations of the very long range influence of interfaces on IL thin films dynamics will be extended. This influence occurs over distances more than an order of magnitude greater than in normal liquids. The long range influence of interfaces can have a major effect on applications of ILs in batteries, externally wetted emitters in electrospray propulsion, and other systems where the IL interface plays an important role. In addition, layered (2D) perovskites, a new class of white light emitters will be investigated. There are three approaches to generating “white light” for illumination, incandescent bulbs, compact fluorescent bulbs, and light emitting diode (LED) bulbs. Perovskite white light emitters may become an important fourth method. In addition to illumination, the mechanism of the broad emission is intrinsically interesting and not yet understood. In the few years since their discovery, 2D perovskites are close to half as efficient as LEDs, but understanding the mechanism can aid in their development. The main experimental methods used in the research will be ultrafast spectroscopies including two-dimensional infrared spectroscopy and other ultrafast IR methods as well as fast fluorescence experiments. The methods address the interplay of dynamics, structure, and interactions and operate on the very short time scales of the fundamental molecular processes. The experiments will be augmented with theory.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Aug 12, 2021
- Source ID
- FA95502010335
Entities
People
- Michael D. Fayer
Organizations
- Air Force Office of Scientific Research
- Stanford University
- United States Air Force