SU713902A1 - Green luminescent luminophore - Google Patents

Description

(54) LUMINOFOR GREEN COLOR GEL

The invention relates to a luminophore composition of a green color of luminescence, which can be used in color television CRTs, in luminescent colors, and also in devices for visualizing infrared radiation. A green luminescent phosphor based on niobium and rare earth oxides, containing an activating additive of ytterbium and erbium oxides, is known. Its disadvantage is the instability of the characteristics under electron bombardment conditions caused by partial reduction of the niobium ions to the tetravalent state. Also known is a green luminescent phosphor based on oxide, oxide of tantalum and a rare earth element selected from the group consisting of yttria, lanthanum, gadolinium and lutex, containing tertiary additive of terbi oxide or ytterbi and erbium oxides. The molar ratio of tantalum oxide to rare-earth oxide is 0.2-1.2. The disadvantage of this phosphor is the low luminance of the luminescence. The aim of the invention is to create a phosphor having a higher luminance brightness. For this phosphor on. Based on tantalum and rare-earth oxides selected from the group consisting of yttrium, lanthanum, gadolinium and lutetium, which includes an activating additive terbium oxide or ytterbium and erbium oxides, contains these components in the following ratio, mol: Tantalum oxide 5-11 Oxide of rare-earth element 0, 7-0.99 Activating additive 0.01-0.3 When the activating additive consists of ytterbium and erbium oxides, their number in the phosphor is 0.010, 25 M and 0.05 - 0.29 M, purely.

To obtain the proposed phosphor, a mixture of tantalum oxides of rare-earth element and an activating additive, taken in appropriate quantities, is ground in the presence of a standard, is then pressed into tablets 20 mm in diameter on a hydraulic press under a pressure of 1.5 tons / cm and calcined by fi in air in for 5O hour, then rubbed to a fine powder (with a particle size of 4-6 microns). The resulting luminophore is white in color, with no higher luminescence efficiency than the known one, the additional advantage of the proposed pymynophore is its high temperature resistance under conditions of electron bombardment, not alkali and in concentrated acids.

The drawing shows a graph of the emission spectrum of one of the specific compositions of the proposed phosphor, containing 0.8 MUduO, 7 M Ta, j, 05, 0.1, and OD M Er2O3 I when excited by radiation of 960 nm.

The magnitudes of the luminosity of the various compositions of the lacquer offered in relation to the luminance of the initial compositions of the known luminophore are given in the drying table. So, the loss in weight of the proposed phosphor in a vacuum of 10 mm Hg. at 5OOk, when exposed to an electric triple beam, the 0 1 O kV for 28 hours is O, O 2-0, O 4%, while the loss in weight of the known phosphor under the same conditions is O, O 5-O, 1%, 3 Formula Shadow Formula 1. A green luminescent phosphor based on tantalum and rare earth oxides selected from the group consisting of yttrium, lanthanum, gadolium and lutetium, containing a terbium or ytterby II erbium oxide activating additive, characterized in that in order to increase the brightness of the luminescence, it contains the indicated components at the following ratio, s: Oxide Oxide tantala5-11 rare earth elementa0,7-0,99

- REL. ed

ten

S50 yu uk soo pr cl. cl. (etc

; t, HH

600

650 Activating agent, О1-О, 3. 2. A phosphor according to claim 1, in accordance with the fact that it contains components for the next time, mol; Tantalum oxide 5–11 Rare earth metal oxide 0,7–0,99 Ytterbi oxide 0.01–0.25 Erbium oxide O, 05-O, 29 Sources of information, which are noted during examination 1. Japan patent 3912-74 , 13 (9) C 114, published. 01/29/74. 2. Japanese patent M 34311-74, 13 (9) C 114, 13.09.74 otyoty).

Claims (2)

Claim 1. A green phosphor of a glow based on tantalum oxides and a rare-earth element selected from the group consisting of yttrium, lanthanum, gadolinium, and lutetium containing an activating additive for terbium oxide or ytterbium oxide and erbium oxide, characterized in that, in order to increase brightness glow, it contains these components in the following ratio, mol: ¹⁵ Tantalum oxide 5-11 Rare Earth Oxide 0.7-0.99 Activating additive 0.01-0.3, 2. Phosphor pop. 1, characterized in that it contains the indicated components in the following ratio, mol: Oxide of tantalum Oxide of rare earth element Oxide of ytterbium Oxide of erbium