Thermal stability characterization for practical use of quantum-dot based global optical sensor on anodized-aluminum

A thermal stability of quantum-dot on an anodized aluminum support is presented for a practical use of this type of global optical sensor. The thermal stability is characterized by the luminescence output of the sensor. To apply this type of sensor for a global temperature measurement, the thermal stability is characterized in a wide temperature range from 100 to 450 K and in the time range from 0 to 1000 s. It is shown that the thermal stability is hold below 298 K. Above 315 K, a sudden decrease and recovery of the luminescent output is measured. It is found that the amount of decrease is proportional to the temperature. The maximum decrease in the intensity is 89% at 475 K after 1000 s. At 315 K, the intensity is recovered to the initial amount after 1000 s. A model describing the luminescence change is introduced based on the thermal degradation and recovery. From the time derivative of the model, the thermal-stabilization time can be determined. The stabilization time exists above 315 K, which is related to the tolerance of the luminescence change due to the measurement purposes.