Pressure-induced emission enhancement: A review

Abstract

The luminescent properties of some materials undergo significant changes under compression. High pressure generated by a diamond anvil cell (DAC) is often used as an external stimulus to explore the relationship between the structures and luminescent properties of materials, provide traceable color and structural changes, and quantify the environment in which the materials are located. Under high pressure, the luminous intensity or color of materials changes, which has important potential applications in fields such as safety detection, information storage, optoelectronic devices, and mechanical sensing. Recently, many phenomena of pressure-induced luminescence enhancement have been discovered in DAC, commonly referred to as pressure-induced emission enhancement. In this review, recent pressure-induced emission enhancement phenomena have been collected, and the role of pressure in promoting the luminescent enhancement of materials in DAC was revealed and discussed, which helps to design some materials with specific emission characteristics and provides a perspective for in-depth research on the photophysical behavior of materials.

Pressure-Induced Enhancement of Room-Temperature Phosphorescence in Heavy Halogen-Containing Imide and Polyimide

“…The discovery of pressure-induced emission enhancement (PIEE) in organic crystals has spotlighted the potential of solid organic materials. − Generally, when luminescent polymers, especially π-conjugated polymers, are subjected to high pressure, they experience a red-shift in the absorption spectrum and emission peak, along with a decrease in emission intensity due to increased intermolecular interactions. However, poly(2,4,6-trimethylphenylene methylene) reportedly exhibits an unusual PIEE .…”