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首页> 外文会议>Organic Optoelectronics and Photonics II >Amplified spontaneous emission in TPD-based waveguides: Thickness and TPD concentration dependence
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Amplified spontaneous emission in TPD-based waveguides: Thickness and TPD concentration dependence

机译：基于TPD的波导中的自发放大：厚度和TPD浓度依赖性

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摘要

The concentration dependence of amplified spontaneous emission (ASE) in optically pumped polystyrene (PS) films containing a variable concentration (between 2.5 and 100 % by weight (wt)) of the luminescent and hole-transporting organic molecule N,N'-Bis(3-methylphenyl)-N,N'-diphenylbenzidine (TPD) is studied. It is observed that the photoluminiscence (PL) efficiency, the ASE threshold and the linewidth above threshold, decrease with concentration up to 20 wt % doped films and then keeps a constant value up to concentrations of 100 wt % (neat films). The position of ASE can be tuned between 413 nm and 421 nm by changing the concentration of TPD. It was also possible to tune the ASE position (between 404 and 417 nm) trough control of the film thickness (between 100 and 200 nm). The observed shifts of the ASE position due to changes in concentration are determined by the PL efficiency (not by the waveguiding characteristics of the films). On the other hand, the observed shifts in the ASE position due to changes in film thickness depend on the shape of the PL spectrum and on cut-off thickness limitations. In this case, the ASE thresholds depend on the different confinement of the propagation modes due to thickness variations.
机译：光泵浦聚苯乙烯（PS）薄膜中放大的自发发射（ASE）的浓度依赖性，该薄膜包含可变浓度（2.5％至100％重量（wt））的发光和空穴传输有机分子N，N'-Bis（研究了3-甲基苯基）-N，N'-二苯基联苯胺（TPD）。观察到，光致发光（PL）效率，ASE阈值和阈值以上的线宽随着浓度最高掺杂薄膜的增加而降低，直到浓度达到20 wt％为止，然后保持恒定值，直到浓度达到100 wt％（纯薄膜）。可以通过改变TPD的浓度在413 nm和421 nm之间调整ASE的位置。还可以通过控制膜厚度（在100和200 nm之间）来控制ASE位置（在404和417 nm之间）。观察到的由于浓度变化引起的ASE位置偏移是由PL效率（而不是由薄膜的波导特性）决定的。另一方面，由于膜厚的变化而引起的ASE位置的变化取决于PL光谱的形状和截止厚度的限制。在这种情况下，ASE阈值取决于厚度变化导致的传播模式的不同范围。

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