1 research outputs found
Photon Upconversion through a Cascade Process of Two-Photon Absorption in CsPbBr<sub>3</sub> and Triplet–Triplet Annihilation in Porphyrin/Diphenylanthracene
Photon upconversion constitutes an
exceptionally rich area of research
in photonics and electronics, where low-energy light is converted
to high-energy light through nonlinear processes represented by two-photon
absorption (TPA) and triplet–triplet annihilation (TTA). Here,
we report a cascade process of TPA in inorganic perovskite quantum
dots (PQDs) of CsPbBr<sub>3</sub> and TTA in an organic molecule (9,10-diphenylanthracene)
mediated by an octaethylporphyrinatoplatinumÂ(II) (PtOEP) sensitizer.
This sequential energy transfer enables upconversion from four photons
from a near-infrared femtosecond laser at 800 nm to one photon at
430 nm with a large anti-Stokes shift of ∼1.3 eV. We characterize
the energy transfer from PQDs to PtOEP by picosecond lifetime spectroscopy
and a Stern–Volmer plot of the steady-state photoluminescence
while considering dynamic and static quenching as well as trivial
absorption and Förster (fluorescence) resonance energy transfer.
The serial connection of TPA and TTA achieved in a simple system opens
up an attractive avenue in nonlinear photonics and harvesting of low-energy
photons