Color-Tunable Multifunctional Excited-State Intramolecular Proton Transfer Emitter: Stimulated Emission of a Single...

Area of Science:

• Photophysics and organic materials science.
• Laser technology and photonics.
• Supramolecular chemistry and molecular engineering.

Background:

• Excited-state intramolecular proton transfer (ESIPT) chromophores possess a four-level photocycle, enabling dual fluorescence emission from enol and keto forms.
• These properties make ESIPT compounds promising for laser action generation.
• Previous research focused on emission from distinct enol and keto species.

Purpose of the Study:

• To explore stimulated emission from deprotonated ESIPT molecules for novel laser applications.
• To develop a tunable active material based on a novel rigidified 2-(2'-hydroxyphenyl)benzothiazole derivative.
• To achieve real-time tunable laser output and white light generation.

Main Methods:

• Synthesis of a novel rigidified 2-(2'-hydroxyphenyl)benzothiazole derivative.
• Investigation of excited-state intramolecular proton transfer (ESIPT) properties.
• Fabrication of a red-green-blue device through rational engineering of emissive species ratios.
• Construction of a continuously tunable distributed feedback laser using a degenerated two-wave mixing setup.

Main Results:

• Stimulated emission was achieved for the first time from a deprotonated ESIPT molecule.
• A novel rigidified benzothiazole derivative facilitated this new emission pathway.
• A device capable of red-green-blue emission and white light generation was successfully fabricated.
• A continuously tunable distributed feedback laser was constructed, demonstrating real-time tunability.

Conclusions:

• Deprotonated ESIPT molecules offer a new avenue for stimulated emission, expanding their application in laser technology.
• The developed rigidified benzothiazole derivative serves as a versatile platform for tunable laser materials.
• This work paves the way for advanced optical devices with tunable emission properties, including white light sources.