In　this　work,　a　home-made　fibre　optic　temperature　sensor　has　been　designed　to　measure　temperatures　ranging　from　−100　°C　to　800　°C　by　combining　fluorescence　lifetime　and　thermal　radiation　temperature　measurement.　Firstly,　a　high-temperature-resistant　fluorescent　material,　Y(P,V)O4:Eu3+,　was　used　to　measure　temperatures　below　400　°C　based　on　the　relationship　between　the　fluorescence　lifetime　and　temperature.　Secondly,　the　thermal　radiation　at　the　wavelength　of　1490　nm　was　detected　and　fitted　with　a　fourth-order　expression　for　temperatures　above　300　°C.　The　temperature　overlap　zone　of　the　two　methods　ranges　from　300　°C　to　360　°C.　Finally,　the　temperature　measured　using　fluorescence　lifetime　was　used　to　calibrate　the　constant　term　in　the　equation　of　thermal　radiation　in　this　overlapping　range.　The　combination　of　fluorescence　lifetime　thermometry　and　thermal　radiation　thermometry　enables　accurate　temperature　measurements　ranging　from　−100　°C　to　800　°C.　©　2024　Informa　UK　Limited,　trading　as　Taylor　&　Francis　Group.