摘要
利用金属有机物化学气相沉积系统在蓝宝石衬底上通过有源层的变温生长,得到In组分渐变的量子阱结构,从而获得具有三角形能带结构的InGaN/GaN多量子阱发光二极管(LED)(简称三角形量子阱结构LED).变温光致发光谱结果表明,相对于传统具有方形能带结构的量子阱LED(简称方形量子阱结构LED),三角形量子阱结构有效提高了量子阱中电子和空穴波函数的空间交叠,从而增加了LED的内量子效率;电致发光谱结果表明,三角形量子阱结构LED器件与传统结构LED器件相比,明显改善了发光峰值波长随着电流的蓝移现象.通过以上的结果比较,三角形量子阱结构LED比传统结构LED具有更高的发光效率.
InGaN/GaN triangular shaped multiple quantum wells（MQWs） grown on sapphire substrate were adopted as an active layer of light-emitting diodes（LEDs） by modulating In content in well layers.The temperature dependence of the normalized integrated photoluminescence（PL） intensity showed that the overlap of the electron and hole wave-functions of the LEDs with triangular shaped MQW is much higher than that of the LEDs with conventional rectangular MQW structures,which improves the internal quantum efficiency（IQE） to a certain degree.On the other hand,it was found that the blue shift of the peak energy as a function of injection current is improved for the device with triangular shaped MQW structure from the electroluminescence（EL） spectra of the two series devices.The comparison above indicates that the triangular MQW LEDs are more efficient and more stable.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2010年第7期4996-5001,共6页
Acta Physica Sinica
基金
国家自然科学基金(批准号:60276029)
国家高技术研究发展计划(批准号:2004AA311020
2006AA03Z409)资助的课题~~
