Color tuning and efficiency enhancement through interfacial energy transfer and thickness control in light-emitting diodes
Color tuning and efficiency enhancement through interfacial energy transfer and thickness control in light-emitting diodes
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DOI：
10.1063/1.1765857
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发表时间：
2004-08
影响因子：
3.2
通讯作者：
Liming Ding;F. E. Karasz
中科院分区：
文献类型：
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作者：
Liming Ding;F. E. Karasz
我们报告了一种可能的界面能量转移现象，在双层发光二极管（LED）组成的聚（对苯撑乙烯）（PPV）的空穴传输层和发光聚合物层含有两个蓝色发光聚合物（I和II）。薄膜形式的聚合物具有几乎相同的光致发光（PL）光谱，尽管它们具有不同的带隙，如从它们的吸收光谱和PL光谱确定的。这是由于聚合物II膜中的分子间能量转移，因为后者的结构包含两种不同的低聚发色团，它们被长的非共轭嵌段规则地散布。在双层LED中，PPV不仅用作改善空穴注入的空穴传输层，而且还用作通过界面能量转移参与调节LED发射颜色的发色团。PPV的吸收光谱和I或II的发射光谱之间的显著光谱重叠支持这种能量转移。PPV的存在可以…
We report a possible interfacial energy transfer phenomenon in double-layer light-emitting diodes (LEDs) consisting of a poly(p-phenylene vinylene) (PPV) hole-transport layer and an emitting polymer layer containing either of two blue emitting polymers (I and II). The polymers in film form have almost the same photoluminescence (PL) spectra though they have different band gaps as determined from their absorption and PL spectra. This is due to intermolecular∕intramolecular energy transfer in polymer II films since the latter structure contains two differing oligomeric chromophores regularly interspersed by long nonconjugated blocks. In double-layer LEDs, PPV functions not only as a hole-transport layer which improves hole injection but also as a chromophore participating in the tuning of the LED emission color through interfacial energy transfer. The significant spectral overlap between the absorption spectrum of PPV and the emission spectra of I or II supports this energy transfer. The presence of PPV can...