Abstract:
A discharge electrode emitting electrons into a discharge gas, encompasses an emitter and current supply terminals configured to supply electric current to the emitter. The emitter embraces a wide bandgap semiconductor having at 300 K a bandgap of 2.2 eV or wider. Acceptor impurity atoms and donor impurity atoms being doped in the wide bandgap semiconductor, the activation energy of the donor impurity atoms being larger than the activation energy of the acceptor impurity atoms.
Abstract:
A barium-free electron emissive material comprises a barium-free metal oxide composition and operable to emit electrons on excitation. A lamp including an envelope, an electrode including a barium-free electron emissive material and a discharge material, is also disclosed.
Abstract:
Low-pressure mercury vapor discharge lamp has a discharge vessel (10) enclosing, in a gastight manner, a discharge space (13) provided with a filling of mercury and an inert gas in a gastight manner. The discharge vessel comprising electrodes (20a; 20b) arranged in the discharge space for maintaining a discharge in the discharge space. According to the invention, the probability of failure of the low-pressure mercury vapor discharge lamp being substantially determined by one of the electrodes. As upon igniting the low-pressure mercury vapor discharge lamp the ignition-related events influence the electrodes, preferably, the ignition-related events substantially are prevented affecting the one electrode.
Abstract:
A description is given of a low-pressure gas discharge lamp equipped with a gas discharge vessel containing, as a buffer gas, an inert gas filling and an indium halogenide, thallium halogenide, gallium halogenide and/or copper halogenide, and with electrodes and means for generating and maintaining a low-pressure gas discharge, and which comprises one or more chalcogenides of alkaline earth metals as electron emitter material.
Abstract:
An electron emitter includes a coating layer of a mixture of carbon nanotubes and alkaline-earth metal oxides on an electrically conducting structure. The preferred carbon nanotubes are those having a diameter less than about 200 nm. A substantial portion of electron emission is liberated from the carbon nanotubes, thus lessening the requirement on the alkaline-earth oxides. Such an electron emitter is advantageously used in gas discharge devices to increase the energy efficiency thereof.
Abstract:
An electron emissive composition comprises a barium tantalate composition of the formula (Ba1−x, Cax, Srp, Dq)6(Ta1−y, Wy, Et, Fu, Gv, Caw)2O(11±δ) where δ is an amount of about 0 to about −3; and wherein D is either an alkali earth metal ion or an alkaline earth ion; E, F, and G, are alkaline earth ions and/or transition metal ion; x is an amount of up to about 0.7; y is an amount of up to about 1; p and q are amounts of up to about 0.3; and t is an amount of about 0.05 to about 0.10, u is an amount of up to about 0.5, v is an amount of up to about 0.5 and w is an amount of up to about 0.25. A method for manufacturing an electron emissive composition comprises blending a barium tantalate composition with a binder; and sintering the barium tantalate composition with the binder at a temperature of about 1000° C. to about 1700° C.
Abstract:
A cold cathode discharge device with high efficiency of light emission and long life is prepared by a cold cathode having both high secondary electron emission and anti-spattering property. Using carbon system cold cathodes constituted of a mixed phase of diamond and graphite, a cold cathode discharge device with high efficiency of light emission and long life is realized. It is desirable that an element having a wavelength of light emission equal to or shorter than 200 nanometers should be mixed in the discharge gas.
Abstract:
Improved emission coating formulation, an electrode blank having the emission coating thereon, the electrode resulting from firing such a coated electrode blank, and the gas discharge electric devices utilizing such fired electrodes are claimed wherein the improvement is in the incorporation of iron oxide and/or cobalt oxide (a) into the emission coating formulation, (b) having a separate iron oxide and/or cobalt oxide coating layer on the electrode blank, or (c) firing the electrode blank with iron oxide and/or cobalt oxide being placed in the immediate environment of the coated electrode blank prior to firing the electrode. Improvements which result include the reduction of carbon deposits or blackening on the electrode and the gas discharge electric device internal surfaces; reduction in the operating temperature of the device, increased linear footage of devices that can run from a given transformer; reduced power requirements; reduction in the number of transformers needed for a given linear footage of devices; and improved quality and consistency of electrode production; among others.
Abstract:
A glow discharge lamp has a discharge vessel, a pair of electrodes mounted in the discharge vessel, ionizable filling which is principally made of rare gas and filled in the discharge vessel, and emissive material containing zinc alloy and provided on at least one of the electrodes.
Abstract:
A fluorescent lamp comprises a glass tubular body defining a discharge space, and first and second electrode assemblies mounted in the discharge space in opposition to each other, each of the electrode assemblies comprising a first electrode and a second electrode. Each of the first electrodes comprises a metal lead wire with an electron-emitting material disposed on a free end thereof, and each of the second electrodes comprises a cup-shaped tube coaxially surrounding one of the first electrodes and the electron-emitting material disposed on the first electrode. The second electrode tube and the electron emitting material therein form an annular gap therebetween.