The band gap regulation of HgxCd1-xTe quantum dots by ion exchange and their near-infrared self-absorption characteristics

In this paper???monodispersed CdTe quantum dots are synthesized by soft chemical method.Meanwhile???mer???cury cadmium telluride???HgxCd1-xTe???quantum dots with the quasi continuous visible to near-infrared spectrum are pre???pared by ion exchange adjusting the concentration of Hg2+.The variable temperature photoluminescence and self-absorp???tion characteristics of near-infrared Hg0.33Cd0.67Te quantum dots are deeply analyzed.The results indicate that the fluores???cence intensity of HgxCd1-xTe quantum dots decreases linearly with the increase of temperature???0 similar to 100 degrees C???.The spectralline broad and the peak position has a red-shift???12nm???.The partial overlap of absorption and emission spectra of quan???tum dots leads to self-absorption.The increase of self-absorption results in decrease of photoluminescence intensity while the concentration of quantum dots increases