Single-Molecule Doped Crystalline Nanosheets for Delicate Photophysics Studies and Directional Single-Photon Emitting Devices

TL;DR

This paper demonstrates the use of single dibenzoterrylene molecules in crystalline anthracene nanosheets as a stable platform for detailed photophysics studies and the development of bright, directional single-photon emission devices at room temperature.

Contribution

It introduces a new solid-state platform with high stability and versatility for single-molecule photophysics and single-photon device fabrication, enabling real-time observation and device integration.

Findings

Real-time observation of single molecule insertion site jump

Quantitative measurements of dipole moment changes

Bright single-molecule emission with Gaussian pattern

Abstract

Single molecules in solids have been considered as an attractive class of solid-state single quantum systems because they can be chemically synthesized at low cost to have stable narrow transitions at desired wavelengths. Here we report and demonstrate single dibenzoterrylene molecules in crystalline anthracene nanosheets as a robust and versatile solid-state platform for delicate photophysics studies and building blocks of single-photon devices. The high-quality nanosheet sample enables robust studies of delicate single-molecule photophysics at room temperature, including the first real-time observation of single molecule insertion site jump, quantitative measurements of the associated changes of dipole moment orientation and magnitude, unambiguous determination of excitation-power dependent intersystem crossing rate and triplet lifetime. Moreover, we demonstrate the flexible assembly of the nanosheets into a planar antenna device to achieve bright single-molecule emission with a Gaussian emission pattern. The thin thickness, good photostability and mechanical stability make the dibenzoterrylene-in-anthracene nanosheet system an excellent candidate of static quantum nodes in integrated photonic circuit.