本論文利用螢光粉受熱之光譜特性變化來對螢光粉層的溫度進行預測。實驗以噴塗式白光LED為量測樣品，紀錄樣品於受熱過程中之溫度、光色、光強度與頻譜等資訊，並針對每種加熱條件下之輻射頻譜進行函數擬合。我們採用光譜儀量測之數據來建立資料庫，比較各波長藍光晶片與不同色溫變數下之螢光光譜特徵，並選取擁有一致性之波長區間進行函數擬合，以便找出螢光粉輻射光譜與螢光粉溫度之對應關係。;In this thesis, we predict temperature of phosphor with fitting parameters of emission spectra, and investigate distribution of phosphor’s temperature with multiple package types. At the same time, we also analyze angular correlated color temperature deviation in this case. In the experiment, we choose pcW-LED of conformal coating type, and the severe high temperature condition was applied to the whole measurement duration, with recording the information of temperature, light intensity, spectrum and chromaticity. In addition, we utilize the parameter fitting of different spectra for each condition. Due to the heat source is varied with injection different currents, we can establish the database for spectral information. And we will compare two variables with different blue peak wavelengths and different phosphor’s thicknesses. Finally, in order to find the correspondence between the spectral characteristics and phosphor’s temperature, we select consistent region of wavelength to fit.