Related Experiment Video
Updated: May 24, 2026
11:26
Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light
Published on: September 12, 2014
Low power, non-coherent sensitized photon up-conversion: modelling and perspectives.
Angelo Monguzzi1, Riccardo Tubino, Sajjad Hoseinkhani
1Dipartimento di Scienza dei Materiali, Università Milano Bicocca, Italy. angelo.monguzzi@mater.unimib.it
Physical Chemistry Chemical Physics : PCCP
|February 29, 2012
Summary
Non-coherent sensitized photon up-conversion (SUC) efficiently converts UV to NIR light, boosting photovoltaic performance by capturing lost sub-bandgap photons. This study details SUC photophysics and optimization for technological applications.
Area of Science:
- Materials Science
- Photochemistry
- Renewable Energy
Background:
- Non-coherent sensitized photon up-conversion (SUC) offers high quantum yields at low excitation powers.
- SUC spans the ultraviolet (UV) to near-infrared (NIR) spectrum.
- It is applicable to lighting and photovoltaics for managing sub-bandgap photons.
Purpose of the Study:
- To present a comprehensive description of SUC photophysics.
- To analyze parameters influencing photon conversion quantum yield.
- To define optimal working ranges (threshold and saturation intensity) for SUC systems.
Main Methods:
- Analysis of photophysical properties of involved moieties.
- Investigation of the SUC solid host matrix effects.
- Development and validation of a predictive model for SUC systems.
Main Results:
- Identified key parameters affecting SUC quantum yield.
- Demonstrated dependence of threshold and saturation intensity on material properties and host matrix.
- Achieved a validated SUC yield of 0.26 ± 0.02.
Conclusions:
- The proposed model is a powerful tool for evaluating new SUC systems.
- Results provide guidelines for optimizing SUC efficiency.
- SUC is a promising technology for enhanced energy applications.
More Related Videos
Related Concept Videos
01:14Photoluminescence: Applications
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...
01:22Photoreceptors and Visual Pathways
At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...
02:26Photoelectric Effect
When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
01:23Photoluminescence: Fluorescence and Phosphorescence
Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
A pair of electrons in a...
A pair of electrons in a...
01:37Super-resolution Fluorescence Microscopy
Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been developed.