Abstract
We present a novel method for detecting the quantum dots’ (QDs) stability at room temperature. The device is fabricated by combining blue InGaN chips with luminescent colloidal core-shell CdSe-ZnSe QDs. We design a simple holder to fix the SMD-LED for ensuring detected position always the same. Although using the QDs as phosphor for the fabrication of LED is more easily, however, the QDs are unstable owing to lattice mismatch, photooxidation and thermal aggregation. Therefore, we encapsulate QDs into PMMA to protect QDs from oxidation and aggregation. By this way we can improve the stability of QDs at room temperature which increases the feasibility for replacing the phosphors such as YAG with QDs. Finally，we use this technique to fabricate WLED(White Light Emitting Diode)，it not only shows the good stability but also exhibits good properties on efficiency and purity of white light.