Highly efficient organic long persistent luminescence based on host-guest doping systems.

Area of Science:

• Materials Science
• Organic Chemistry
• Photophysics

Background:

• Organic long persistent luminescence (OLPL) is a promising luminescence pathway initiated by exciplex formation.
• Current OLPL materials suffer from low quantum yields, limited molecular diversity, and high fabrication costs, hindering their development.

Purpose of the Study:

• To develop novel OLPL materials with high quantum yields and improved properties.
• To explore the potential of phenothiazine derivatives as guest molecules in OLPL systems.
• To investigate the thermal stability and applicability of the developed OLPL materials.

Main Methods:

• Synthesized a series of multi-guest/host OLPL materials by doping four phenothiazine derivative guest molecules into 9H-xanthen-9-one host matrices.
• Investigated the photophysical properties, including quantum yield and luminescence characteristics.
• Evaluated the performance of the OLPL materials at high temperatures.

Main Results:

• Achieved highly efficient emission with a quantum yield of 46.3% in air for the F-substituted phenothiazine derivative doping system.
• Demonstrated the effectiveness of phenothiazine derivatives as guest molecules in enhancing OLPL properties.
• Confirmed the high luminescence efficiency of these materials at elevated temperatures.

Conclusions:

• Successfully developed simple, cost-effective OLPL materials with high quantum yields.
• The F-substituted phenothiazine derivative system shows exceptional performance, offering a new avenue for efficient OLPL.
• These materials exhibit excellent heat resistance, paving the way for applications in high-temperature environments.