Related Experiment Video
Updated: Sep 27, 2025

Time-resolved Photophysical Characterization of Triplet-harvesting Organic Compounds at an Oxygen-free Environment Using an iCCD Camera
Published on: December 27, 2018
Expounding the Relationship between Molecular Conformation and Room-Temperature Phosphorescence Property by Deviation
Yuan Gao1, Qiuyan Liao1, Menghan Li1
1Hubei Key Lab on Organic and Polymeric Optoelectronic Materials, Sauvage Center for Molecular Sciences, Department of Chemistry, Wuhan University, Wuhan 430072, P.R. China.
Researchers developed ultralong room-temperature phosphorescence (RTP) emitters by modifying diphenylamine (DPA) structures. Increasing phenyl unit deviation angles in DPA significantly extended RTP lifetimes, offering a new principle for designing organic luminogens.
Area of Science:
- Organic Chemistry
- Materials Science
- Photophysics
Background:
- Room-temperature phosphorescence (RTP) is crucial for advanced applications.
- Achieving persistent organic afterglow is challenging due to unclear structure-property relationships.
Purpose of the Study:
- To investigate the relationship between molecular structure and RTP lifetime in diphenylamine (DPA) derivatives.
- To establish a design principle for enhancing RTP properties.
Main Methods:
- Synthesized DPA derivatives with varying ortho-substituted alkyl moieties.
- Measured RTP lifetimes and analyzed molecular conformations.
- Correlated structural parameters with phosphorescence properties.
Main Results:
- RTP lifetimes were extended from 129 ms to 661 ms through structural modifications.
- The deviation angle (θ) of phenyl units from the conjugated plane was identified as a key determinant of RTP lifetime.
- Larger deviation angles correlated with longer RTP lifetimes.
Conclusions:
- The deviation angle of phenyl units in DPA is a critical parameter for controlling RTP lifetime.
- This finding provides a universal principle for designing organic luminogens with tunable ultralong RTP.
Related Concept Videos
Variables Affecting Phosphorescence and Fluorescence
Photoluminescence: Applications
Photoluminescence: Fluorescence and Phosphorescence
A pair of electrons in a...
Fluorescence and Phosphorescence: Instrumentation
¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR
¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

