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Temperature-dependent chip spectra at . From top to bottom, the temperatures of the curves are 310, 330, 350, 370, 390, 410, and .
(a) Circles indicate peak positions of the quantum well EL signal at various temperatures; the solid line indicates the linear fit with a slope of . (b) The squares depict the peak positions of the GaAs PL signal at various temperatures. Solid, short dashed, and long dashed lines are obtained from the Varshni equations, (Ref. 17), (Ref. 18), and (Ref. 19), respectively.
(a) Spectra of the chip biased at various currents with a chuck temperature of . (b) Peak positions of the quantum well EL signals (circles) and the GaAs substrate PL signals (squares) at various currents.
Junction temperatures measured by the emission peak energy shift method (circles) and by the self-excited GaAs PL method (squares).
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