Related Experiment Video
Updated: Mar 16, 2026

Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light
Published on: September 12, 2014
Photon Upconversion at Crystalline Organic-Organic Heterojunctions.
Michael Oldenburg1, Andrey Turshatov1, Dmitry Busko1
1Karlsruhe Institute of Technology, Institute of Microstructure Technology (IMT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany.
Triplet transfer was observed in a metal-organic-framework heterojunction using triplet-triplet annihilation photon-upconversion. This demonstrates efficient electron movement across the junction, crucial for advanced optoelectronic devices.
Area of Science:
- Materials Science
- Photochemistry
- Nanotechnology
Background:
- Metal-organic frameworks (MOFs) offer tunable electronic properties.
- Triplet-triplet annihilation photon-upconversion (TTA-UC) is a key process for light harvesting.
- Efficient charge transfer is essential for optoelectronic device performance.
Purpose of the Study:
- To demonstrate triplet transfer across a surface-anchored MOF heterojunction.
- To investigate the mechanism of photon-upconversion in a sensitizer-emitter system.
- To assess the quality of the MOF heterojunction for electron transport.
Main Methods:
- Fabrication of a surface-anchored MOF heterojunction.
- Utilizing triplet-triplet annihilation photon-upconversion (TTA-UC) as a detection method.
- Analysis of the double-electron-exchange mechanism for triplet transfer.
Main Results:
- Successful observation of TTA-UC in the MOF heterostructure.
- Achieved low upconversion thresholds below 1 mW cm-2.
- Confirmed efficient triplet transfer across the MOF interface.
Conclusions:
- The MOF heterojunction facilitates efficient triplet transfer.
- The observed double-electron-exchange mechanism highlights the heterojunction's quality.
- This work paves the way for solution-processed MOF-based optoelectronic devices.
More Related Videos
06:08Time-resolved Photophysical Characterization of Triplet-harvesting Organic Compounds at an Oxygen-free Environment Using an iCCD Camera
Published on: December 27, 2018
11:44Using Cyclic Voltammetry, UV-Vis-NIR, and EPR Spectroelectrochemistry to Analyze Organic Compounds
Published on: October 18, 2018
Related Concept Videos
Photoluminescence: Applications
Photochemical Electrocyclic Reactions: Stereochemistry
Selection Rules: Photochemical Activation
Photoluminescence: Fluorescence and Phosphorescence
A pair of electrons in a...
Photoelectric Effect
IR Absorption Frequency: Hybridization
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that...
Deactivation Processes: Jablonski Diagram