Phosphor　sedimentation　is　a　key　factor　affecting　the　light　quality　and　optical　consistency　of　white　light-emitting　diodes　(LEDs).　Herein,　a　detection　method　based　on　optical　coherence　tomography　(OCT)　is　proposed　to　realize　rapid,　nondestructive　detection　of　phosphor　sedimentation　in　white　LEDs.　For　this　purpose,　a　white　LED　was　imaged　by　an　OCT　system.　Subsequently,　the　OCT　and　section　images　of　the　LED　were　compared,　and　the　quantity　distribution　and　sediment　morphology　of　phosphor　were　analyzed.　In　addition,　an　algorithm　was　developed　to　extract　the　area　fraction　of　phosphor　from　the　OCT　images　based　on　the　relationship　between　the　quantity　and　area　fraction　of　phosphor　and　the　variations　in　quantity　distribution　during　sedimentation.　Furthermore,　the　relationship　between　the　area　fraction　of　phosphor　and　the　degree　of　phosphor　sedimentation　was　studied.　The　experimental　results　show　that　OCT　can　accurately　determine　the　phosphor　sediment　morphology　in　white　LEDs　and　that　the　area　fraction　of　phosphor　observed　in　the　OCT　images　can　quantify　the　degree　of　phosphor　sedimentation.　This　method　can　meet　the　detection　requirements　of　phosphor　sedimentation　in　white　LEDs　and　can　be　used　for　their　quality　testing　and　packaging　process　research.　©　2024　Universitat　zu　Koln.　All　rights　reserved.