Temperature dependence of the luminescence of nanocrystalline CdS/Mn2+

Abstract

\u3cp\u3eThe temperature dependence of the luminescence properties of nanocrystalline CdS/Mn\u3csup\u3e2+\u3c/sup\u3e particles is investigated. In addition to an orange Mn\u3csup\u3e2+\u3c/sup\u3e emission around 585nm a red defect related emission around 700 nm is observed. The temperature quenching of both emissions is similar (T\u3csub\u3eq\u3c/sub\u3e ≈ 100 K). For the defect emission the reduction in the lifetime follows the temperature dependence of the intensity. For the Mn\u3csup\u3e2+\u3c/sup\u3e emission however, the intensity decreases more rapidly than the lifetime with increasing temperature. To explain these observations a model is proposed in which the Mn\u3csup\u3e2+\u3c/sup\u3e ions are excited via an intermediate state involving shallowly trapped (≈ 40 meV) charge carriers.\u3c/p\u3