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Pressure-induced emission enhancement and bandgap narrowing . . . Abstract We report high-pressure photoluminescence, Raman scattering, and x-ray diffraction measurements on a lead-free halide perovskite At about 3 GPa, an electronic transition manifests itself through a broad minimum in linewidth, a maximum in the intensity of , Raman modes, and the unusual change in the ratio of the trigonal lattice
Pressure tailoring electron-phonon coupling toward enhanced yellow . . . High pressure, generated from diamond anvil cells (DACs), has been widely used in optical control, band-gap optimization, morphology tailoring, and even the improvement of emission efficiency of metal halide perovskites 22,23,24,25,26,27,28 In a representative high-pressure research achievement about zero-dimensional (0D) perovskite Cs 4 PbBr 6, a new concept of pressure-induced emission (PIE
Pressure-induced emission enhancement: A review - AIP Publishing In addition to the above-mentioned perovskite materials, metal halide materials, carbon dots, and organic luminescent materials, pressure-induced emission enhancement has also been found in many other materials, 99 such as metal–organic frameworks, compound semiconductor materials, transparent conductive oxides, organic inorganic hybrid
Pressure-induced giant emission enhancement, large band gap narrowing . . . Abstract Layered lead halide perovskites are attractive materials for optoelectronic applications In this work, temperature-dependent photoluminescence (PL) as well as pressure-dependent Raman and PL studies of lead bromide comprising small disc shape 1,2,4-triazolium cations (Tz +) are reported
Pressure-induced robust emission in a zero-dimensional hybrid metal . . . 12at room temperature that can survive to 80 GPa, the recorded highest value among all the hybrid metal halides In situ experimental characterization and first-principles calculations reveal that the pressure-induced emission is mainly caused by the largely suppressed phonon-assisted nonradiative pathway Lattice compression leads to phonon hardening, which considerably weakens the exciton
High-pressure Induced Phase Transition and Laser Characterization Introduction Metal halide perovskites (MHPs) are materials with the ABX3 crystal structure, where the A-site is occupied by an organic cation (e g , Cs+, CH3NH3+ (MA), or NH2CH=NH2+ (FA)), the B-site by a metal cation (e g , Pb2+), and the X-site by halide anions (Cl−, Br−, I−) These materials are widely used in photovoltaics, including solar cells, light-emitting diodes (LEDs), and
Pressure-induced emission enhancement and bandgap narrowing . . . The narrowing of the bandgap under pressure is also observed in bismuth and antimony-based halide perovskites The increase of hybridization of atomic orbitals driven by the reduction of bond length and bridging bond angle leads to narrowing of the bandgap, as seen in zero-dimensional (0D) Cs3Bi2I9 [3]
Pressure-induced emission enhancement with an abnormal blue shift of . . . These findings provide a basis for understanding the structure-properties correlation of -metal ions doped 0D perovskite, and shed light on the effects of the pressure in emission enhancement and tuning the optical properties of halide perovskites