PREPARATION OF LUMINOUS DIODE INDICATOR

摘要

PURPOSE:To prevent scraps of electrodes from encroaching in wafer and to prevent the lowering and deterioration of luminous efficiency. CONSTITUTION:On the back of the formed LED wafer 2 of a pn-junction 1 an electrode 3 and an electrode 5 are provided leaving thereby on the surface a passage 4 of a cutter blade. After preparing a groove 6 deeper than the pn-junction 1 in the center of the passage, it is separated into LED 7. The element 7 is etched so as to remove strain and to fix the electrode surface between lead wires 8. A contact area is large enough because both sides of the element are covered with electrodes. According to said method a leakage current passage is not formed and therefore the lowering and deterioration of luminous efficiency can be prevented.