CAJ | 학술논문

利用MOCVD方法在蓝宝石衬底上生长了In_xGa_(1-x)N/In_yGa_(1-y)N多量子阱结构外延层,并用变温光致发光(PL)光谱、选择激发光谱以及激发(PLE)光谱等手段研究了该结构的量子效率、多峰效应的起源以及峰位随温度变化等信息.变温PL光谱的结果表明:在温度从30 K变化到300 K时,其峰值强度只下降了1.36倍且发光波长发生了蓝移.通过选择激发光谱证明了其发光峰位的独立性.PLE结果表明了GaN和势垒层的Stokes位移很小,但是In_xGa_(1-x)N阱层的Stokes位移变化很大.同时,提出了一种可同时获得多个吸收边的数据处理方法.
이용MOCVD방법재람보석츤저상생장료In_xGa_(1-x)N/In_yGa_(1-y)N다양자정결구외연층,병용변온광치발광(PL)광보、선택격발광보이급격발(PLE)광보등수단연구료해결구적양자효솔、다봉효응적기원이급봉위수온도변화등신식.변온PL광보적결과표명:재온도종30 K변화도300 K시,기봉치강도지하강료1.36배차발광파장발생료람이.통과선택격발광보증명료기발광봉위적독립성.PLE결과표명료GaN화세루층적Stokes위이흔소,단시In_xGa_(1-x)N정층적Stokes위이변화흔대.동시,제출료일충가동시획득다개흡수변적수거처리방법.
The In_xGa_(1-x)N/In_yGa_(1-y)N multiple quantum well structures were grown on sapphire substrate by metal-organic chemical vapor deposition (MOCVD). The quantum efficiency, multi-emission peaks effects and peak-shift information were observed by temperature dependent photoluminescence (PL) spectra, selective excitation PL spectra and PL excitation spectra. The temperature dependent PL spectra showed that the intensity of the main emission peaks decreased only by a factor of 1.36 and peak position has a blue-shift when temperature increases in 30～300 K. Selective excitation PL spectra showed that every peak appeared in PL spectra is separate. The PLE result shows a small Stokes shift for GaN and barrier layer while it is larger for the well layers. A fitting method was also suggested to obtain several absorption edges simultaneously.