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Synthesis and Calibration of Phosphorescent Nanoprobes for Oxygen Imaging in Biological Systems
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Thermal-Responsive Phosphorescent Nanoamplifiers Assembled from Two Metallophosphors
Meng-Jia Sun1,2, Yu-Wu Zhong1,2, Jiannian Yao1,2
1Key Laboratory of Photochemistry, Beijing National Laboratory for Molecular Sciences, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.
Angewandte Chemie (International Ed. in English)
|April 18, 2018
Summary
Researchers created tunable, color-changing phosphorescent nanotubes using iridium complexes. These materials exhibit reversible thermal-responsiveness, changing light emission with temperature for potential optical applications.
Area of Science:
- Materials Science
- Supramolecular Chemistry
- Photophysics
Background:
- Developing advanced phosphorescent materials with tunable emission properties is crucial for applications in lighting and sensing.
- Iridium complexes are widely studied for their photoluminescent properties, but controlling their solid-state emission remains a challenge.
- Ordered supramolecular assemblies offer a platform to precisely engineer photophysical processes.
Purpose of the Study:
- To fabricate thermal-responsive phosphorescent nanotubes through co-assembly of neutral iridium complexes.
- To investigate the color-tunable phosphorescence and amplified emission in these nanotubes by varying acceptor doping.
- To explore the reversible thermal-responsiveness and temperature-controlled exciton dynamics.
Main Methods:
- Co-assembly of two neutral iridium complexes into highly ordered crystalline nanotubes.
- Tuning the acceptor doping ratio from 0 to 0.5% to control phosphorescence color.
- Characterization using in situ emission color and spectral changes, lifetime measurements, and low-temperature studies (77 K).
Main Results:
- Fabrication of phosphorescent nanotubes exhibiting color-tunable emission from green to red at room temperature.
- Achieved highly efficient light-harvesting and energy transfer within the nanotubes.
- Demonstrated over 800-fold amplification of acceptor emission compared to pure solid samples.
- Observed reversible thermal-responsiveness: suppressed energy transfer at 77 K, reactivated at room temperature.
- Confirmed temperature-controlled exciton dynamics as the cause of luminescent thermochromism.
Conclusions:
- The co-assembly approach successfully yielded ordered phosphorescent nanotubes with tunable emission.
- Efficient energy transfer and light-harvesting in these supramolecular structures enable significant emission amplification and color tuning.
- The reversible thermal-responsiveness highlights the potential of these materials for temperature-sensitive optical devices.
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