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Enhanced Photoluminescence of Oxygen Sensing Films through Doping with High Dielectric Constant Particles

机译：通过掺杂高介电常数粒子增强氧传感薄膜的光致发光

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摘要

A uniquely simple approach to increase the intensity of the photoluminescence (PL) of dye-doped sensor films is demonstrated for oxygen sensors, where the sensor film, i.e., Pt or Pd octaethylporphyrin (PtOEP or PdOEP, respectively)-doped polystyrene, is additionally doped with small-size particles that have a high dielectric constant, such as 360 nm-diameter titania (TiO_2) particles. When excited by an organic light emitting device (OLED), the dye PL intensity increases up to ～ 10 fold, depending on the TiO_2 concentration and the excitation source. The enhanced PL is attributed to light scattering by the embedded particles and possibly by voids in the film. The particles scatter the light that excites the PL, increasing the optical path of the exciting light and consequently the absorption of that light and the PL. The particles can also result in an increase in the PL outcoupling, reducing waveguiding to the film edges. The increased PL results in an improved signal-to-noise (S/N) ratio in oxygen monitoring, without any deterioration or change in the response time or the long-term stability of the sensor films. In addition, at a given O_2 level, the dye PL decay time t increases in the presence of the particles, but is independent of their concentration in the measured range. The improved S/N can improve the analyte limit of detection, allow shortened data acquisition times, and enable the use of low-intensity excitation sources to minimize potential dye photobleaching. In particular, it improves the performance of structurally integrated OLED-based chemical and biological sensors, which are drawing increasing attention due to their uniquely simple and flexible integration geometry.
机译：对于氧气传感器，展示了一种独特的简单方法来增加染料掺杂传感器膜的光致发光（PL）强度，其中还另外添加了传感器膜，即掺杂Pt或Pd八乙基卟啉（分别为PtOEP或PdOEP）的聚苯乙烯。掺杂具有高介电常数的小尺寸颗粒，例如360 nm直径的二氧化钛（TiO_2）颗粒。当被有机发光器件（OLED）激发时，染料PL的强度增加到〜10倍，这取决于TiO_2的浓度和激发源。增强的PL归因于嵌入颗粒的光散射，也可能归因于薄膜中的空隙。粒子散射激发PL的光，从而增加了激发光的光路，从而增加了该光和PL的吸收。颗粒还会导致PL外耦合的增加，从而减少导向膜边缘的波。增加的PL可以改善氧气监测中的信噪比（S / N），而响应时间或传感器膜的长期稳定性不会降低或改变。另外，在给定的O_2水平下，染料PL的衰减时间t在存在颗粒的情况下增加，但与它们在测量范围内的浓度无关。改进的信噪比可以改善分析物的检测极限，缩短数据采集时间，并可以使用低强度激发源来最大程度地减少潜在的染料光漂白。特别是，它提高了基于结构集成的基于OLED的化学和生物传感器的性能，由于其独特的简单和灵活的集成几何结构，它们引起了越来越多的关注。

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