ZnSeTe/ZnSe量子阱中Te等电子陷阱的静压光子发光谱研究

PHOTOLUMINESCENCE OF Te ISOELECTRONIC TRAPS IN ZnSeTe/ZnSe QUANTUM WELLS UNDER HYDROSTATIC PRESSURE

测量了ZnSe0 .92 Te0 .0 8 ZnSe超晶格量子阱材料在 77K时 0～ 7.8GPa静压下的光致发光谱 .观察到ZnSe0 .92Te0 .0 8阱层中Te等电子陷阱上的束缚激子发光 ,发现它的压力系数比ZnSe带边发光的压力系数小约 5 0 % ,表明Te等电子陷阱对激子的束缚势是相当局域的 .还观察到了激子在ZnSe0 .92 Te0 .0 8阱层中的Te等电子陷阱能级与相邻 (CdSe) 1 (ZnSe) 3

The photoluminescence (PL) of ZnSe0.92TeD0.08/ZnSe superlattice quantum wells at 77K under hydrostatic pressure up to 7.8 GPa was studied. Strong PL peaks from excitons trapped in isoelectronic traps in ZnSe0.92Te0.08 were observed. It was found that the pressure coefficients of the PL, peaks from Te traps are about half of that of ZnSe. It demonstrates the localized characteristic of the potential of Te isoelectronic. traps. The excitons transition between Te traps in ZnSe1 Te-- x(x) and (CdSe)(1) /(ZnSe)(3) superlattice was also investigated.