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Lead halide perovskite (APbX3) has recently emerged as a promising active layer in light-emitting diodes (LEDs) as well as an absorber for photovoltaic devices. For better LED properties, it is important to understand the fundamental mechanism of the optoelectronic behaviors, e.g., how the nanostructure of APbX3 thin film correlates with its emitting properties. We investigated the effect of APbBr3 (A=CH3NH3,Cs) crystallite size on the photophysical properties regarding its crystallographic changes and spin-orbit coupling. Photoluminescence lifetime measurements, X-ray and electron diffraction analyses, and density functional theory calculations were performed. We demonstrate that the emitting properties of mesoscale APbBr3 crystallites are improved due to the formation of pure cubic phase that leads to the spin- and momentum-allowed carrier recombination. Our findings provide fundamental insights into the emitting behavior of APbBr3, which suggests a control of its optoelectronic properties by means of modulating the crystal morphology and resultant electronic band structures.
This article was published in the following journal.
Name: The journal of physical chemistry letters
Pressure-quenching of optical emission largely limits the potential application of many materials in optical pressure-sensing devices, since emission intensity is crucially connected to performance. B...
In this Letter, the design, fabrication, and characterization of slow light devices using photonic crystal waveguides (PhCWs) in the mid-infrared wavelength range of 3.9-3.98 μm are demonstrated. Th...
We present a GeSbTe (GST)-integrated ring resonator with the tuning enabled by an all-optical phase change of GST using a sequence of optical pulses. The tuning is non-volatile and repeatable, with no...
Manipulating the distribution of rare earth activators in multiple cations' sites of phosphor materials is an essential step to obtain tunable emission for the phosphor-converted white-light-emitting ...
A multicolor tunable CaWO:xDy nanophosphors have been synthesized via hydrothermal route. X-Ray Diffraction and Fourier transform infrared confirm the formation of CaWO:Dy nanophosphors. Transmission ...
Light Emitting Diode (LED) therapy has been investigated in burns and skin ulcers, as it has a bactericidal effect and promotes tissue repair. This study aims to evaluate LED therapy at di...
The aim of this study was to evaluate the effect of casein phosphopeptide amorphous calcium phosphate fluoride paste (CPP-ACPF) associated with low level laser therapy (LLLT) in the sympto...
The aim of this study was to evaluate the effect of nanohydroxyapatite associated with low potency laser therapy in eliminating or reducing dentin hypersensitivity in a randomized placebo-...
The purpose of this study is to test whether shifts in the timing of the biological clock to a later hour (phase delay shifts of the human circadian system) can be produced in response to ...
This is a two-phase study, consisting of the following plan: Phase I - This is a pre-test of the feasibility and acceptability of the beta version of a computer-delivered intervention, Mo...
Emission of LIGHT by a substance as its temperature is raised. It is sometimes called hot light in contrast to LUMINESCENCE.
Emission of LIGHT when ELECTRONS return to the electronic ground state from an excited state and lose the energy as PHOTONS. It is sometimes called cool light in contrast to INCANDESCENCE. LUMINESCENT MEASUREMENTS take advantage of this type of light emitted from LUMINESCENT AGENTS.
Tunable liquid lasers with organic compounds (i.e., dye) which have a strong absorption band, used as the active medium. During emission, the dye has to be optically excited by another light source (e.g., another laser or flash lamp). The range of the emission wavelength may be anywhere from the ultraviolet to the near infrared (i.e., from 180 to 1100nm). These lasers are operated in continuous wave and pulsed modes. (UMDNS, 2005)
Lasers with a semiconductor diode as the active medium. Diode lasers transform electric energy to light using the same principle as a light-emitting diode (LED), but with internal reflection capability, thus forming a resonator where a stimulated light can reflect back and forth, allowing only a certain wavelength to be emitted. The emission of a given device is determined by the active compound used (e.g., gallium arsenide crystals doped with aluminum or indium). Typical wavelengths are 810, 1,060 and 1,300 nm. (From UMDNS, 2005)
The interval between two successive CELL DIVISIONS during which the CHROMOSOMES are not individually distinguishable. It is composed of the G phases (G1 PHASE; G0 PHASE; G2 PHASE) and S PHASE (when DNA replication occurs).
Radiology is the branch of medicine that studies imaging of the body; X-ray (basic, angiography, barium swallows), ultrasound, MRI, CT and PET. These imaging techniques can be used to diagnose, but also to treat a range of conditions, by allowing visuali...