Photo-Electro-Thermal Theory for LED Systems: Basic Theory and Applications by Ron Hui

Author:Ron Hui [Hui, Ron]
Language: eng
Format: azw3
Publisher: Cambridge University Press
Published: 2017-09-30T04:00:00+00:00

Figure 5.3(a) Measured spectral power distributions for a Sharp 4.4 W LED for a range of values of electrical power Pd

Figure 5.3(b) Measured peak wavelengths of blue spectra versus electrical power for the Sharp 4.4 W and 8 W LED samples

(ii) For Phosphor Coating

The measured peak wavelengths of the phosphor spectra as a function of the junction temperature for the two LED samples are given in Figure 5.3(a) and (c), which clearly show a decreasing peak wavelength of the phosphor spectra with junction temperature. The same physical observation has been reported in [8]. The data form two straight lines with negative slopes, which can be expressed by the linear equation (5.7).

λpeak_phosphor(Tj) = kpeak_phosphor(Tj − T0) + βpeak_phosphor.

(5.7)

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