Based on the above result, we further study the temperature characteristics of the ratio of the PL intensity in QD arrays and discuss the effect that activation has on the temperature dependence. In fact, the change of activation energy presents the change of the QD size. In the high density QD arrays system, supposing that the activation energy of small QD
EA2 = 0.14 eV is fixed
5, when we adjust the activation of large QD
EA1, that is, change the difference of the activation energy of the two kinds of QD, the temperature dependence relationship of the ratio of the PL intensity
I1/
I2 in bimodal QD arrays can be obtained (shown in