EP 1027401 A1 20000816 - USE AS PHOSPHOR DOT IN A PLASMA OR X-RAY SYSTEM OF A LANTHANUM PHOSPHATE COMPRISING THULIUM
Title (en)
USE AS PHOSPHOR DOT IN A PLASMA OR X-RAY SYSTEM OF A LANTHANUM PHOSPHATE COMPRISING THULIUM
Title (de)
ANWENDUNG ALS LEUCHTMITTEL IN EINEM PLASMASYSTEM ODER RÖNTGENSTRAHLENSYSTEM VON EINEM LANTHANUM- PHOSPHAT MIT THULIUM
Title (fr)
UTILISATION COMME LUMINOPHORE DANS UN SYSTEME A PLASMA OU A RAYONNEMENT X, D'UN PHOSPHATE DE LANTHANE COMPRENANT DU THULIUM
Publication
Application
Priority
- FR 9802275 W 19981023
- FR 9713367 A 19971024
Abstract (en)
[origin: FR2770223A1] Thulium-containing lanthanum phosphate is used as a blue-emitting phosphor in an X-ray or plasma system.- DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: - (i) an X-ray or plasma system which includes a thulium-containing lanthanum phosphate as phosphor; - (ii) a lanthanum phosphate and a lanthanum phosphate-based phosphor which contain thulium and which consist of particles of 1-20 microns average size with a dispersion index of less than 0.6; and - (iii) preparation of the above lanthanum phosphate by introducing a solution of lanthanum, thulium and optionally gadolinium salts into a phosphate ion-containing solution of pH less than 3, controlling the pH at a constant value of less than 2 during precipitation, and then recovering and optionally thermally treating the precipitate.- Preferred Feature: The lanthanum phosphate contains 0.1-10 (especially 0.5-5) atom % thulium and may also contain gadolinium
IPC 1-7
IPC 8 full level
G21K 4/00 (2006.01); C01B 25/45 (2006.01); C09K 11/77 (2006.01); C09K 11/81 (2006.01)
CPC (source: EP KR US)
C09K 11/7777 (2013.01 - EP KR US); H01L 33/502 (2013.01 - KR)
Designated contracting state (EPC)
DE FR GB NL
DOCDB simple family (publication)
FR 2770223 A1 19990430; FR 2770223 B1 20020614; CA 2307132 A1 19990506; CN 1278855 A 20010103; EP 1027401 A1 20000816; JP 2001521055 A 20011106; KR 20010015788 A 20010226; US 6419852 B1 20020716; WO 9921938 A1 19990506
DOCDB simple family (application)
FR 9713367 A 19971024; CA 2307132 A 19981023; CN 98811135 A 19981023; EP 98951544 A 19981023; FR 9802275 W 19981023; JP 2000518032 A 19981023; KR 20007004396 A 20000424; US 53009000 A 20000703