Experimental spectra of LED R1 at two different junction temperatures.
Experimental spectra of LED R1 on a logarithmic scale and with frequency as main variable. The dashed lines show the Boltzmann exponential behavior.
The solid line (a) corresponds with the measured spectrum. The line (b) represents the spectrum model according to Eq. (2), while the line (c) represents the Gaussian fit of the difference between (a) and (b). The dashed line (d) is the simulated spectrum according to the model of Eq. (3).
Carrier temperature variation with junction temperature for the solid lines, dashed lines, and dotted-dashed lines diodes. Squares are used for LEDs from manufacturer 1, diamonds are used for devices from manufacturer 2.
Peak frequency shift (squares) and shift in (diamonds) with junction temperature for the LED R1. The dashed lines represent linear fits.
Radiant flux variation with junction temperature of LED R1 for the complete spectrum (squares), (diamonds), (triangles), and (inverted triangles). The dashed lines represent exponential fits with the same characteristic temperature.
Comparison of measured and simulated spectra for LED R1 at 340 K, starting from a reference spectrum measured at 300 K. The solid line (b) is the measured spectrum at 340 K, while the dashed line (c) is the simulated single color spectrum.
Experimental peak frequencies and fitting parameters for all LEDs at . Coefficients of determination have been added for the Gaussian fits. For the exponential fits all values exceed 0.99.
Variation in carrier temperature , total spectrum’s peak frequency , and the Gaussian peak frequency with junction temperature, together with the characteristic temperature . values exceed 0.95 for all fits.
Comparison between measured and simulated flux and CIE color coordinates at 340 K.
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