Photon upconversion based on sensitized triplet-triplet annihilation in bi-component systems is a multistep process that involves a triplet-triplet energy transfer (ET) from a donor to an acceptor moiety. This is aimed at sensitizing the population of annihilating optically dark triplets that generates the high energy photoluminescence. A large resonance between the involved triplets is usually recommended because it increases the energy gain between absorbed and emitted upconverted photons. However, it also enables efficient back-ET from acceptor to donor triplets, with potential detrimental consequences on the system performance. Here, we analyze a model system, where the energy difference between donor and acceptor triplets is lower than kBT at room temperature by means of time resolved and steady state photoluminescence spectroscopy, and develop a kinetic model, which describes the iterative loop that transfers the triplet exciton between the donor and acceptor molecules. In such a way, we obtained the guidelines for the optimization of the system composition required to overcome the back-ET effect and maximize the upconversion quantum yield.
Meroni, D., Monguzzi, A., & Meinardi, F. (2020). Photon upconversion in multicomponent systems: Role of back energy transfer. THE JOURNAL OF CHEMICAL PHYSICS, 153(11).
|Citazione:||Meroni, D., Monguzzi, A., & Meinardi, F. (2020). Photon upconversion in multicomponent systems: Role of back energy transfer. THE JOURNAL OF CHEMICAL PHYSICS, 153(11).|
|Tipo:||Articolo in rivista - Articolo scientifico|
|Carattere della pubblicazione:||Scientifica|
|Presenza di un coautore afferente ad Istituzioni straniere:||No|
|Titolo:||Photon upconversion in multicomponent systems: Role of back energy transfer|
|Autori:||Meroni, D; Monguzzi, A; Meinardi, F|
MONGUZZI, ANGELO MARIA (Corresponding)
|Data di pubblicazione:||2020|
|Rivista:||THE JOURNAL OF CHEMICAL PHYSICS|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1063/5.0021253|
|Appare nelle tipologie:||01 - Articolo su rivista|