Optoelectronic
devices based on all-inorganic perovskite systems
are an energy-efficient source of lighting due to their high photoluminescence
quantum yield (QY). However, dominant surface trapping continues to
plague the field, despite their high defect tolerance, as evidenced
by the several-fold improvements in the external quantum efficiency
of perovskite nanocrystals (NCs) upon appropriate surface passivation
or physical confinement between high-band-gap materials. Here, we
introduce the concept of drip-feeding of photoexcited electrons from
an impurity-induced spin-forbidden state to address this major shortcoming.
An increased and delayed (about several milliseconds) excitonic QY,
Raman spectroscopy demonstrating specific vibrational modes of the
PbX6 octahedra, and density functional theory establish
the electron back-transfer, signifying an efficient recombination.
We term this electron back-transfer from Mn2+ to the host
conduction band in this prototypical example of Mn-doped CsPbX3 (X = Cl, Br) NCs through vibrational coupling as vibrationally
assisted delayed fluorescence (VADF).
Existing processes for the decontamination of heavy metals from water are found to be cost-prohibitive and energy-intensive which is totally against the sustainable concept of development. Green nanotechnology for water purification for ecosystem management, agricultural and industry is an emerging as leading global priority and occupies better position over the current state of water purification. Herein, the diafunctionalised polyaniline modified nanocellulose composite sorbent (PANI-NCC) has been used to introduce amine and imine functionalities for the removal of trivalent and hexavalent chromium from water bodies. The fabricated nanobiomaterial has been authenticated by modern spectroscopic, microscopic techniques. The modified PANI-NCC is rod-like in shape, ~60 nm in size. The roughness and crystallinity index is also quantified and found to be 49.67 nm and 84.18%, respectively. The optimised experimental finding provides the efficient removal of trivalent [Cr(III)] (47.06 mg/g; 94.12%) and hexavalent [Cr(VI)] (48.92 mg/g; 97.84%) chromium from synthetic waste water. The fabricated nano biosorbent is deemed to be a potent biosorbent for technological development to remove the toxic metals in the real environmental water samples.
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