自问自答了，刚找到答案，原来已经有人发现这个问题了，都有文章“甲醇溶液的荧光光谱特性”，真是粗心啊，

any molecule which has a lowest excited state with longer life time (>10 ps) can emit fluorescence. However, for methy the relatively strong flu peak is around 300 nm, still close to UV range, so it has less application. Besides, methynol is usually used as solvent, not a probe，

谢谢解答，学到更多了，

甲醇乙醇和水等溶剂有荧光吗？ 只有拉曼峰，它们不满足荧光产生的条件。