提出了一种新的光谱———吸收归一化光致发光激发谱 ,并用这种光谱研究了非掺杂GaN薄膜的黄光发射。实验上首次直接测出了黄光发射的初始态的共振吸收峰位 ,从而解决了长期争论的有关黄光发射的发光机理问题 A new spectrum, absorption normalized photoluminescence excitation spectrum, was proposed and used to study the yellow emission of undoped GaN thin films. For the first time, the resonance absorption peak in the initial state of yellow emission was measured for the first time, thus solving the long-standing debate on the emission mechanism of yellow emission