Example of normal Stokes emission through fluorescence (left, red) and anti-Stokes emission (right, blue) through sensitized triplet-triplet annihilation based photon upconversion, samples excited with green light.Upconversion fluorescence. Optical fiber that contains infrared light shines with a blue color in the dark
Photon upconversion (UC) is a process in which the sequential absorption of two or more photons leads to the emission of light at shorter wavelength than the excitation wavelength. It is an anti-Stokes type emission. An example is the conversion of infrared light to visible light. Upconversion can take place in both organic and inorganic materials, through a number of different mechanisms. Organic molecules that can achieve photon upconversion through triplet-triplet annihilation are typically polycyclic aromatic hydrocarbons (PAHs). Inorganic materials capable of photon upconversion often contain ions of d-block or f-block elements. Examples of these ions are Ln3+, Ti2+, Ni2+, Mo3+, Re4+, Os4+, and so on.
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Photonupconversion (UC) is a process in which the sequential absorption of two or more photons leads to the emission of light at shorter wavelength than...
signals (heterodyning) Photonupconversion Block upconverter This disambiguation page lists articles associated with the title Upconversion. If an internal link...
authentication capabilities. Photonupconversion is an anti-Stokes process where lower-energy photons are converted into higher-energy photons. An example of this...
electronic states in organic molecules with uses in photocatalysis, photonupconversion and photodynamic therapy. Generally, photosensitizers absorb electromagnetic...
conventional solar cells. Photonupconversion is the process of using two low-energy (e.g., infrared) photons to produce one higher energy photon; downconversion...
absorption of a pump photon. This process of further exciting an already excited laser-active ion is known as photonupconversion. ETU is normally an unwanted...
paperboard grade Undercarriage, also known as landing gear, on aircraft Photonupconversion, an optical phenomenon University Challenge, a popular British quiz...
signal and probe signal to create a signal with a new frequency via photonupconversion, which is subsequently detected. The probe scans through delay times...
fewest photomultiplier tubes. Collecting luminescent radiation in photonupconversion devices with the compound parabolic concentrator being to-date the...
Tang, X.; Fejer, M. M. (2011-10-17). "Long-wavelength-pumped upconversion single-photon detector at 1550 nm: performance and noise analysis". Optics Express...
harvesting, long-wavelength emission, imaging, frequency doubling, and photonupconversion. Other accomplishments include: defining molecular wires that enable...
laser sources consisting of photons in the visible light frequency range to generate a single laser source with photons of different frequencies in the...
excited-state absorption is usually an undesired effect, but it can be useful in upconversion pumping. Excited-state absorption measurements are done using pump–probe...
transition that emits a photon with more energy than that of the incident photon. This would be the nuclear analog of upconversion in laser physics. If the...
Wang, Jianfang; Sun, Ling-Dong; Yan, Chun-Hua (December 2014). "Photon energy upconversion through thermal radiation with the power efficiency reaching 16%"...
this level, one is often interested to control and access higher-order photon-correlation effects, distinct many-body states, as well as light–semiconductor...
to excite optical active materials, under upconversion processes with different numbers of excitation photons, has been analyzed as well. Monodisperse...
(1 July 2005). "Highly efficient single-photon detection at communication wavelengths by use of upconversion in reverse-proton-exchanged periodically...
diode-pumped solid-state infrared lasers with frequency-doubling to 408nm upconversion of direct diode semiconductor lasers via thulium- or praseodymium-doped...
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