Abstract:
The inner surfaces of fluorescent lamp tubing are provided with a phosphor coating. The phosphor coating defines an inward-facing surface. A protective coating is deposited on the inward-facing surface of the phosphor coating. The protective coating defines an innermost surface and makes effective recombination of Hg ions possible on the innermost surface of the second coating before the Hg ions collide with the phosphor particles in the phosphor coating.
Abstract:
An illuminating light source (30), and a scanner module (60) and an image scanning apparatus including the same. The illuminating light source (30) includes: a vacuum tube (31) have a cylindrical shape, is filled with a discharging gas (35), and has a light emitting portion (31) disposed in a lengthwise direction thereof; a discharging electrode (40) disposed upon the vacuum tube (31), and having a width that increases from a center portion to end portions thereof; and a fluorescent body disposed within the vacuum tube (31), to absorb first light beams emitted by the discharging gas (35) and to emit second light beams having a longer wavelength than the first light beams, with the second light beams being illuminated through the light emitting portion (31).
Abstract:
A vacuum ultraviolet-excited phosphor is composed of a gadolinium-activated rare-earth aluminum-scandium borate that is represented by a general formula (Y 1-x Gd x )Al 3-y Sc y (BO 3 ) 4 (where 0
Abstract:
A vacuum ultraviolet-excited phosphor is composed of a gadolinium-activated rare-earth aluminum-scandium borate that is represented by a general formula (Y 1-x Gd x )Al 3-y Sc y (BO 3 ) 4 (where 0
Abstract:
An ultraviolet reflecting layer and a fluorescent lamp is described, comprising an envelope having an inner surface, means within the lamp envelope for generating ultraviolet radiation, a light emitting layer of a luminescent material for generating visible light when impinged by ultraviolet radiation, and said ultraviolet reflecting layer, located between the light emitting layer and the inner surface of the lamp envelope, wherein the ultraviolet reflecting layer comprises a metal phosphate and/or a metal borate, with the metal being selected from Sc, Y, La, Gd, Lu and Al, or combinations thereof. The phosphates or borates used in the ultraviolet reflecting layer may optionally be doped by a Tb3+ and/or Dy3+ activator, to further improve the quantum yield of the conversion of UV radiation into visible light.
Abstract:
A fluorescent lamp, characterized in that the lamp comprises a glass tube the inner wall of which is coated with phosphor and which is filled with a metal vapor and a rare gas, discharge electrodes provided at both ends of the tube, electrode leads supporting the discharge electrodes and adapted for supplying electric power to the discharge electrodes, and reflecting plates each provided between an end sealing part at one end of the tube and the discharge electrode, and that the reflecting plates reflect part of the radiation produced by the discharge caused in the tube and part of the light emitted from the phosphor excited by the radiation, both parts traveling toward the tube ends.
Abstract:
A luminescent material (26) for a mercury discharge lamp (10) comprises a phosphor material including phosphor particles for emitting a luminous flux upon excitation by ultraviolet radiation at 254 nm and a protective layer continuously formed on the phosphor particle with at least one metal oxide selected from the group consisting of MgO, Y2O3, La2O3, Sm2O3, Gd2O3, Dy2O3, Ho2O3, Er2O3, Yb2O3, Lu2O3, CaO, ZrO2, SrO, BaO, alpha -Al2O3 and BeO. A mercury discharge lamp has a luminescent layer coated with the luminescent material on the wall of the light transmissive bulb thereof.
Abstract:
A lamp is constructed to include a base (12) adapted for connecting to an electric socket to obtain electricity, a shell (10) fastened to the base (12) and defining with the base an air-tight space, the shell (10) having an inside wall coated with a layer of phosphorescent coating (11), an electronic ballast installed in the base (12) and adapted to convert AC power supply into DC power supply, and at least one ultraviolet light emitting diode (14) suspended in the air-tight space and connected to the electronic ballast and adapted to produce ultraviolet light to strike the phosphorescent coating (11) in producing visible light upon connection of the base (12) upon connection of the electronic ballast to power supply.
Abstract:
Leuchtstoffe, die bei Bestrahlung mit VUV-Strahlung, insbesondere mit Wellenlängen im Bereich zwischen ca. 145 nm und 185 nm, im sichtbaren Bereich des optischen Spektrums effizient lumineszieren. Dazu werden gezielt Wirtsgitter ausgewählt, die eine optische Bandlücke von mindestens 6.7 eV aufweisen, insbesondere Borate, Phosphate, Aluminate sowie Silikate. Diese sind mit den Aktivatoren Eu 3+ (Rotleuchtstoffe), Tb 3+ (Grünleuchtstoffe) oder Eu 2+ (Blauleuchtstoffe) dotiert. Eine Leuchtstoffbeschichtung für eine Dreibanden-Leuchtstofflampe besteht bevorzugt aus dem Rotleuchtstoff R: ( Y 0,72 Gd 0,2 Eu 0,08 ) BO 3 , dem Grünleuchtstoff G: ( La 0,43 Ce 0,39 Tb 0,18 ) PO 4 und dem Blauleuchtstoff B: ( Ba 0,94 Eu 0,06 ) MgAl 10 O 17 , wobei die Komponenten im Verhältnis R:G:B=0,36:0,555:0,085 gemischt sind. Fig.7