The dark defects in InGaAsP/InP DH LEDs are observed with an infrared line scanner. The dark structure appears before aging and it exists mainly in the form of dar kspot defect.

• 用红外电视选行扫描仪观察由不同P型掺杂剂的外延片制成的InGaAsP/InP双异质结发光管的暗缺陷,并研究了它的来源。