Simple Stimulus-Responsive Organic Long Persistent Luminescence Systems Based on Methoxy-Functionalized...

Area of Science:

• Materials Science
• Organic Chemistry
• Photophysics

Background:

• Pure organic long persistent luminescence (LPL) materials are underexplored due to poor stability and low quantum yields.
• Triphenylphosphine (TPP) derivatives are potential candidates but require structural modification for improved performance.

Purpose of the Study:

• To synthesize and characterize a novel methoxy-substituted triphenylphosphine derivative (TPP-o-3OMe) for enhanced LPL properties.
• To investigate the photophysical mechanisms, stability, and responsiveness of the new material.

Main Methods:

• Synthesis of TPP-o-3OMe.
• Photoluminescence spectroscopy to measure phosphorescence lifetime (τp) and quantum yield (Φp).
• Evaluation of acid response and cycling stability under heating and ammonia fumigation.

Main Results:

• TPP-o-3OMe demonstrated significantly improved photoluminescence quantum yield (9.28%) and phosphorescence lifetime (394.1 ms).
• The methoxy group promoted n → π* transitions and intersystem crossing, leading to efficient triplet exciton generation.
• The material exhibited good acid response and recyclability, indicating enhanced stability.

Conclusions:

• Methoxy substitution in triphenylphosphine is a viable strategy to create stable, high-efficiency pure organic LPL materials.
• TPP-o-3OMe offers potential applications in anticounterfeiting and smart response technologies.
• This work expands the scope of organic room-temperature phosphorescent materials.