Transient Grating Photoluminescence Spectroscopy: Advancing Optoelectronic Materials Exploration with Ultrafast Photoluminescence Techniques

Lecturer: Kai Chen

Robinson Research Institute, Victoria University of Wellington, New Zealand; MacDiarmid Institute for Advanced Materials and Nanotechnology, New Zealand; The Dodd-Walls Centre for Photonic and Quantum Technologies, New Zealand

Time: 10:00 Oct 23 (Monday), 2023

Location: Room 116, Laser Building

Abstract：

Ultrafast Photoluminescence Spectroscopy (UPS) is an instrumental approach for investigating the photoexcitation dynamics of novel optoelectronic materials, enabling straightforward data interpretation. It utilizes the key role of photoluminescence in optoelectronic applications, selectively probing emissive species to uncover critical processes like energy transfer and carrier thermalization.

UPS has the capacity to track the interactions and evolution of photoexcitation species, using transient photoluminescence spectra to identify the electronic and vibronic structures, local environment, and morphology of materials. However, current UPS methodologies face the significant challenge of simultaneously achieving a high degree of temporal resolution, a broad spectral bandwidth, and an elevated signal-to-noise ratio in their data capture.

We have recently developed Transient Grating Photoluminescence Spectroscopy (TGPLS), which significantly enhances the capabilities of UPS. TGPLS provides sub-picosecond time resolution, broadband detection, and high sensitivity. These improvements position TGPLS as a promising tool for the optical characterization of advanced optoelectronic materials such as perovskites and organic semiconductors.

In this presentation, we will illustrate the application of TGPLS, particularly its role in enriching our understanding of light emission and lasing dynamics in these emerging materials. We will share specific case studies that highlight its potential in revealing intricate photoexcitation processes.