In this work, the photophysical properties of a conjugated polymer poly [2-methoxy-5-(3′,7′-dimethyloctyloxy) (MDMO-PPV) under a wide range of solvents and concentrations were studied. MDMO-PPV in tetrahydrofuran (THF) showed two absorption bands at 333 and 490 nm. Regardless of the optical density, the absorption spectrum did not change with increasing or decreasing the concentration. Consequently, the studies showed that the aggregations were not formed in the ground state for MDMO-PPV for all solvents and concentrations used. On the other hand, the fluorescence spectrum of MDMO-PPV in THF showed two distinctive bands around 555 and 595 nm. By increasing concentration, the profile of the fluorescence spectrum remained constant. Most of PPV derivatives’ spectra are affected by the concentrations and temperatures in the ground or excited states. Nevertheless, the ratio of the intensity bands (555 nm: 595 nm) MDMO-PPV was not significantly affected by the concentration or temperature in both cases. According to our knowledge, the band at 595 nm is not attributed to the excimeric state. Therefore, fluorescence bands 555 and 595 nm are composed of two vibronic transitions and assigned to 0–0, 0–1 respectively. Under pulsed laser excitation of Nd: YAG laser (λ_ex = 355 nm), MDMO-PPV produced an amplified spontaneous emission (ASE) peaks at 597 nm. The ASE peaks may be attributed to 0–1transition.

在这项工作中，研究了共轭聚合物聚[2-甲氧基-5-（3'，7'-二甲基辛氧基）（MDMO-PPV）在各种溶剂和浓度下的光物理性质。四氢呋喃（THF）中的MDMO-PPV在333和490 nm处显示两个吸收带。无论光密度如何，吸收光谱都不会随着浓度的增加或减少而改变。因此，研究表明，对于所用的所有溶剂和浓度，对于MDMO-PPV而言，均未在基态形成聚集体。另一方面，MDMO-PPV在THF中的荧光光谱显示在555和595 nm附近有两个不同的谱带。通过增加浓度，荧光光谱的轮廓保持恒定。PPV衍生物的大多数光谱受基态或激发态的浓度和温度影响。然而，在两种情况下，浓度或温度对MDMO-PPV强度带的比率（555 nm：595 nm）均没有显着影响。据我们所知，595 nm处的谱带不归因于准分子状态。因此，荧光带555和595 nm由两个振动跃迁组成，分别分配为0-0、0-1。在Nd：YAG激光的脉冲激光激发下（λ_ex  = 355 nm），MDMO-PPV在597 nm处产生放大的自发发射（ASE）峰。ASE峰可能归因于0-1跃迁。