研究了MEH—PPV薄膜的放大自发发射特性。当激发强度增加时,从样品边缘发射的光谱发生增益窄化现象并具有明显的阈值特性。我们发现随着薄膜厚度的增加,MEH—PPV薄膜的阈值有所降低,而其增益系数则随之增加。在150nm厚时测得最大净增益系数为25.03cm^-1,最低阈值为2.2μJ/pulse。结果表明MEH—PPV是一种优良的激光和光放大材料。
Amplified spontaneous emission (ASE) from the structure comprised of a poly (2-methoxy-5-( 2'- ethylhexyloxy)-1,4-phenylene vinylene) (MEH-PPV) film deposited on SiO2 was reported. The change of the emission spectra detected from the edge of the sample showed a clear threshold and gain narrowing phenomenon when increasing the excitation intensity. With increasing the thickness of the polymer film, the threshold of ASE diminishes and the net gain increases. A maximum net gain of 25.03 cm^-1 and a minimum threshold of 2.2 μJ/pulse are obtained at the thickness of 150 nm. Our results indicate that MEH-PPV is an attractive gain medium in optically pumped polymer lasers and amplifier.