Room temperature tunable multicolor phosphorescent polymers for humidity detection and information encryption.

Area of Science:

• Materials Science
• Polymer Chemistry
• Photophysics

Background:

• Amorphous polymer-based room temperature phosphorescence (RTP) materials with tunable emission colors are highly sought after but difficult to synthesize.
• Controlling polymer structure and composition is key to achieving desired photophysical properties.

Purpose of the Study:

• To develop novel polyacrylamide-based RTP materials with tunable multicolor emission.
• To investigate the influence of polymer composition on RTP properties and humidity sensitivity.
• To demonstrate the application of these materials in information encryption.

Main Methods:

• Copolymerization of a phosphor with concentration-dependent luminescence and acrylamide at varying molar ratios.
• Characterization of photophysical properties, including RTP emission and lifetimes.
• Evaluation of humidity sensing capabilities based on RTP intensity changes.

Main Results:

• Successfully prepared polyacrylamide-based RTP materials with tunable multicolor emission.
• Demonstrated that hydrogen bonding and crosslinked structures are crucial for efficient RTP.
• Observed a decrease in RTP intensity with increasing humidity, indicating humidity sensing capability.
• Achieved triple encoding for information encryption using distinguishable RTP lifetimes and humidity responsiveness.

Conclusions:

• Polymer composition significantly impacts photophysical properties and enables multicolor emission.
• The developed materials exhibit dual functionality as multicolor emitters and humidity sensors.
• These materials offer a promising platform for advanced applications like secure information encryption.