Collins III, W.D,Krames, M.R.,Verhoeckx, G.,Van Leth, N.
申请号：
EP20020077252
公开号：
EP1267424(B1)
申请日:
2002.06.10
申请国别(地区):
欧洲专利局
年份:
2018
代理人:
摘要：
Presented is a method of conformally coating a light emitting semiconductor structure with a phosphor layer to produce a substantially uniform white light. A light emitting semiconductor structure is coupled to a submount, a first bias voltage is applied to the submount, and a second bias voltage is applied to a solution of charged phosphor particles. The charged phosphor particles deposit on the conductive surfaces of the light emitting semiconductor structure. If the light emitting semiconductor structure includes a nonconductive substrate, the light emitting semiconductor structure is coated with an electroconductive material to induce phosphor deposition. The electrophoretic deposition of the phosphor particles creates a phosphor layer of uniform thickness that produces uniform white light without colored rings.
