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Heat generation caused by nonradiative relaxation processes in tris-8-hydroxyquinoline aluminum (Alq 3 ) was measured at 2K by using a photocalorimetric (PC) detecting system. At lower temperatures, the photoluminescence (PL) quantum yield is much higher than that at room temperature because of the quenching of thermal disturbance. At 2K, the PL quantum yield of a single crystal specimen and...
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