Doped amorphous and crystalline alkaline earth gallates as electroluminescent materials
US5788882A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 23, 1997 |
| Grant date | Aug 4, 1998 |
| Priority date | — |
| Expiry date | Jan 23, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B33/14
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
New phosphors based on doped alkaline earth gallates for electroluminescent (EL) display materials. Bright red EL has been obtained in amorphous and crystalline alkaline earth gallates doped with europium. Powder targets of nominal compositions Sr.sub.4 Ga.sub.2 O.sub.7, Sr.sub.7 Ga.sub.4 O.sub.13, Sr.sub.3 Ga.sub.2 O.sub.6, Sr.sub.3 Ga.sub.4 O.sub.9, SrGa.sub.4 O.sub.7, SrGa.sub.12 O.sub.19, Ba.sub.4 Ga.sub.2 O.sub.7, Ba.sub.3 Ga.sub.2 O.sub.6 and Ca.sub.3 Ga.sub.4 O.sub.9 doped with 1-2% Eu, were RF magnetron sputtered onto BaTiO.sub.3 substrates. Both annealed and as-deposited films yielded bright EL emission in the red part of the visible spectrum with peaks characteristic of the Eu.sup.3+ ion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.