STABILIZATION OF COLOR IN HEATED ELECTROLUMINESCENT PHOSPHOR

• Main Authors: VANDERPOOL CLARENCE D, GINGERICH RICHARD G. W
• Format: Patent
• Language: English; Korean
• Published: 24.06.2002
• Edition: 7
• Subjects: ADHESIVES; CHEMISTRY; DYES; ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; PAINTS; POLISHES

PURPOSE: A method for increasing the color stability of a ZnS:CuCl electroluminescent substance is provided, by firing it together with a material for increasing of the color stability. CONSTITUTION: The method comprises the steps of forming an electroluminescent substance; and firing the electroluminescent substance in the presence of a material selected from the group consisting of Eu, Ce and Sm in vacuum for a time sufficient to provide the increase of the color stability. Preferably the vacuum pressure is about 730-750 mmHg and the firing time is about 72 hours. Also the method comprises the steps of forming an electroluminescent substance; placing a powdery or granule material selected from the group consisting of Eu, Ce and Sm on the bottom of a reactor; covering the element with a steam-permeable wall; adding the electroluminescent substance in a certain amount to the reactor above the wall; sealing the reactor by ventilation; and heating it. Preferably the wall of the reactor is made of a thick quartz. 형광체를 형성한 다음, 형성된 형광체를 진공에서 Eu, Ce 및 Sm 그룹 중에서 선택된 물질의 존재하에 색-안정성을 증가시키기에 충분한 시간동안 연소하는 단계를 포함하는, 전기발광 형광체의 색-안정성의 증가방법.