نتایج جستجو برای: light emission
تعداد نتایج: 561077 فیلتر نتایج به سال:
Tremendous advances in the study of magnetic light-matter interactions have recently been achieved using man-made nanostructures that exhibit and exploit an optical magnetic response. However, naturally occurring emitters can also exhibit magnetic resonances in the form of optical-frequency magnetic-dipole transitions. Here we quantify the magnetic nature of light emission using energy- and mom...
We report bright white-light electroluminescence (EL) from a diode structure consisting of a ZnO nanorod (NR) and a p-type conducting polymer of poly(fluorine) (PF) fabricated using a hydrothermal method. ZnO NRs are successfully grown on an organic layer of PF using a modified seeding layer. The EL spectrum shows a broad emission band covering the entire visible range from 400 to 800 nm. White...
We report r t visible i i l light li t emission i i from f Shottky tt diodes i made from f semiconducting se i cting polymers, l ers, confirming i ing the t discovery i by the t Cambridge idge group [Nature [ ature 347,, 539 (1990)]. Our r results lt ( 19 0>3. demonstrate trate that t t light-emitting li t-e itting diodes i can be fabricated f i te by casting ti the t polymer film fil from f so...
Graphene and related two-dimensional materials are promising candidates for atomically thin, flexible and transparent optoelectronics. In particular, the strong light-matter interaction in graphene has allowed for the development of state-of-the-art photodetectors, optical modulators and plasmonic devices. In addition, electrically biased graphene on SiO2 substrates can be used as a low-efficie...
Cathodoluminescence (CL) is light emitting phenomena induced by high energy electrons incident on materials. The CL is sometimes defined as light emission caused by the inner electronic transition between the electronic states or bands associated with excitation by the incident electron beam. The typical one is the radiative recombination of carriers in semiconductors, such as the band to band ...
Broadband and anisotropic light emission from rare-earth doped tellurite thin films is demonstrated using Er3+-TeO2 photonic crystals (PhCs). By adjusting the PhC parameters, photoluminescent light can be efficiently coupled into vertical surface emission or lateral waveguide propagation modes. Because of the flexibility of light projection direction, Er3+-TeO2 is a potential broadband light so...
We designed an emission control driver using P-type TFTs to adjust the light emission period of an active matrix organic light emitting diode (AMOLED) displays. The P-TFT emission control driver has achieved rail-to-rail driving and low power consumption. Using this circuit, we can control peak brightness dynamically to reduce panel power consumption and motion blur. We developed 4.3 inch WQVGA...
We demonstrate interference of spontaneous emission of light from two distant solid-state atomic ensembles, when both ensembles are coherently excited by a common laser source. Owing to a strong collective enhancement of the spontaneous emission, the atoms behave as ideal two-level quantum systems and no which-path information is left in the atomic ensembles after emission of a photon. This all...
A mechanism for efficient radiative light emission in GaN is presented. Stokes shifted emission was found to propagate almost exclusively along the c-plane when excited deep behind this surface. Onset of stimulated emission is observed. Emission intensity increases with the magnitude of the Stokes shift which in turn increases with film thickness, i.e. reduced biaxial stress conditions. We prop...
exhaust emissions contribute greatly to air pollution, the social cost of which may occur as danger to human health, attracting huge medical expenses, causing absenteeism and hence loss of productivity. these are incentives to reduce exhaust emissions to the barest minimum. two major cities in ghana, accra and kumasi, are struck by vehicular traffic jams especially during rush-hours and are gra...
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