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Photoluminescence: Applications

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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...

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Author Spotlight: Advancing Bioimaging and Therapy with Functional Nanomaterials

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Achieving trap-depth-tunable organic persistent luminescence through host energy-level engineering.

Chenhan Zhan¹, Cunjian Lin², Rujun Yang¹

¹College of Materials, and Fujian Key Laboratory of Surface and Interface Engineering for High Performance Materials, Xiamen University, Xiamen, China.

Nature Communications

|December 22, 2025

Summary

Researchers developed a new strategy to control trap depth in organic persistent luminescence materials. This breakthrough enables long-lasting deep-blue light emission and efficient energy storage for advanced applications.

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Development of Efficient OLEDs from Solution Deposition

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Published on: November 4, 2022

Area of Science:

Materials Science
Organic Electronics
Photophysics

Background:

Traps are critical for organic persistent luminescence (OPL) but controlling their depth is challenging.
Existing methods lack precision in tuning trap characteristics without affecting OPL properties.

Purpose of the Study:

To introduce a host energy-level engineering strategy for precise control of trap depth in OPL materials.
To demonstrate the tunability of trap depth and its impact on luminescence and energy storage.

Main Methods:

Host energy-level engineering to tune trap depth.
Randall-Wilkins method for trap depth quantification (0.38–0.72 eV).
Density functional theory (DFT) calculations for validation.

Main Results:

Achieved tunable trap depth from 0.38 to 0.72 eV without altering emission wavelength.
Developed a host-guest material (CPND@DPEPO) with a deep trap (~0.72 eV) exhibiting 27-hour deep-blue OPL.
Demonstrated efficient energy storage for 14 days at room temperature.

Conclusions:

Established a fundamental principle for designing organic materials with controllable trap depth.
Developed a pixel-programmable information storage device using OPL materials in organic light-emitting diodes (OLEDs).
Potential applications in night tracing, military communication, and biological imaging.