Research On The Effect Of Spectral Width Of Blue Light And Phosphor Ratios On The Optical Performance Of White Light

Along with the development of science and technology,lighting source has been updated from incandescent lamp to solid-state lighting based on Light Emitting Diode(LED).LED lighting and laser lighting have been received more and more attention t in the field of solid-state lighting.How to achieve the white light with high luminous efficiency and high color rendering index is focused by the researcher both at home and abroad.In this thesis,the effect of spectral width of blue light and phosphor ratios on the optical performance of white light was investigated from the standpoint of theoretical calculation in the hope of establishinga theoretical method to improve the optical performance of white light.The main contents are as follows:1.Based on chromaticity theory,the effect was investigated of the luminous efficiency vary with the spectral width change of excitation source.The results show that,the luminous efficiency reduce slowly with the increase of the spectral width,and different phosphors have their ideal excitation spectral width range,in this range,the effect of luminous efficiency is weak.Corresponding to the YGA-1 and YAG-2 phosphors,the luminous efficiencydecreases linearly when the spectral width changes in the range of 2?18nm and 2?21nm,respectively.The light effect decreases linearly when the spectral width is greater than 18nm and 21nm,respectively.The calculation resultsare validated by usingthe phosphor module of laboratory with remote excitation mode.2.Base on the characteristics of low spectral width and polarization of blue laser,the influence of incident angle and polarization angle to the light energy utilization of blue LED and LD was studied.For the LED,the maximum utilization rate of light energy is 96%;and for Line polarization LD the light energy utilization rate can reach the maximum of 99,9%with brewsterangle as the incident angle and 0 ° as the polarization angle.Based on the conclusions one phosphor powder packaging model used for laser driven white light was put forward and simulated based on Monte Carlo method.3.The influence was studied of white light on the color rendering.index by spectral calculations,the results show that the white color rendering index rise with the increase of the spectral component in the red band.With the two selected phosphor materials,the color rendering index gradually increased from 70.2 to 94.7 with the ratio increased from 0.1 to 1 of red band spectral.Experiments were carried out with the phosphor module prepared in the laboratory,the result of experiments consistent with the conclusion,the spectral power ratio is 9:5:2 of the white light spectrum and the color rendering index is 81 from experiments,the spectral power ratio of 90:19:9 and color rendering index is 84 form the calculation.Spectral calculation method can effectively reflect the white light performance parameters,and the calculation conclusion has the corresponding relationship with the material ratios.4.Based on spectral calculations theory and genetic algorithm,a method was proposedto calculate the spectral power ratio of high color rendering white light at the target color temperature.The spectral power ratio of blue,yellow and red in the white light spectrum is 1:1.56:1.92 andthe color rendering index is 89 and the color coordinates are(0.3956,0.3014)when the color temperature is 2925K of the calculation.The spectral power ratios of blue,yellow and red in the white spectrum is 1:1.59:1.93 and the color rendering index was 84 andthe color coordinates are(0.4012,0.3095)of the experiment.The results of inversion are in agreement with the experimental results.The inversion calculation method can provide a theoretical reference for the preparation of high color rendering phosphor module.