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The upper limit in LED quantum efficiency from conventional closed-shell molecules is 25% as dictated by singlet and triplet spin statistics. Spin-doublet organic molecules are attractive candidates to exceed this limit, thanks to their 100% theoretical quantum efficiency in radiative recombination. However, examples of stable spin-doublet molecules in the solid state are rare. Here we show broad-band near-infrared emission in the columnar π-π stacked tetrathiafulvalene in a metal organic framework (MOF) single crystal. The broad emission is similar to known TFT+• doublet emission and is stabilized in the MOF crystal. This interpretation is supported by the observation of enhanced PL emission following UV oxidation of the MOF crystal to increase the doublet concentration. The findings suggest tetrathiafulvalene-based MOFs as promising materials for near-IR light emission and the MOF structure may be a general strategy to stabilize radical cation species in the solid state.
This article was published in the following journal.
Name: The journal of physical chemistry letters
We report the controlled interfacial interaction in crystallized organic charge transfer thin films, consisting of bis(ethylenedithio)tetrathiafulvalene and C60. The induced broad-band absorption from...
In this paper, we describe amplified spontaneous emission (ASE) from the f' 0g+ (1D2) state of I2 populated through a two-step laser excitation technique via the B 3Π(0u+) valence state. The intense ...
Ultrasonic preparation of near-infrared emission cluster-based Yb and Nd coordination materials: Ratiometric temperature sensing, selective antibiotics detection and "turn-on" discrimination of l-arginine.
Currently near-infrared (NIR) luminescence of lanthanide ions has received great attention because of their unique emissions in the near-infrared region (800-1700 nm). These NIR luminescent material...
Ultrabroadband mid-frequency infrared photodetectors have important applications in surveillance, medical diagnosis, bioimaging and navigation aids. Thus researchers hope to detect mid-infrared radiat...
A promising near-infrared emissive and mitochondria-targeted fluorescence probe (SNB) for the ratiometric detection of sulfur dioxide derivatives with a novel reaction mechanism was developed on the b...
Evaluate safety and efficacy of Broad Band Light (BBL) motion technique treatment for pigmentation, skin tone and texture
There will be five subjects, each with at least one ecchymotic lesion on each arm measuring at least one cm, who will be randomized to undergo 4 Sciton Broad Band Light (BBL) treatments on...
The primary objective is to compare the progression-free survival (PFS) of REGN2810 plus platinum-based doublet chemotherapy combination therapy (REGN2810/chemo) and REGN2810 plus platinum...
The purpose of this clinical study is to compare how well two different devices for achieving hemostasis perform in patients undergoing transradial procedures. Both devices are approved by...
The primary objectives of this study are to evaluate the performance of StatSeal Advanced used in conjunction with the TR Band (SSA) as compared to the TR Band without SSA (TRB) relative t...
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)
Measurement of the regional temperature of the body or an organ by infrared sensing devices, based on self-emanating infrared radiation.
Non-ionizing electromagnetic energy in the frequency range of 100 gigahertz to 10 terahertz which spans from the mid-INFRARED RAYS frequency to the high-frequency edge of the MICROWAVES band.
A bacterial protein from Pseudomonas, Bordetella, or Alcaligenes which operates as an electron transfer unit associated with the cytochrome chain. The protein has a molecular weight of approximately 16,000, contains a single copper atom, is intensively blue, and has a fluorescence emission band centered at 308nm.
That portion of the electromagnetic spectrum usually sensed as heat. Infrared wavelengths are longer than those of visible light, extending into the microwave frequencies. They are used therapeutically as heat, and also to warm food in restaurants.