Optically-Pumped Lasing in Hybrid Organic-Inorganic Light-Emitting Diodes
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- Optically-Pumped Lasing in Hybrid Organic-Inorganic Light-Emitting Diodes
- Song, Myoung Hoon; Kabra, Dinesh; Wenger, Bernard; Friend, Richard H.; Snaith, Henry J.
- Charge transport; Device structures; Distributed feedback; External efficiency; High refractive index; In-plane; Lasing emissions; Luminescence efficiencies; Metal oxide layers; Optical modes; Organic semiconductor; Organic-inorganic; Photoluminescence efficiency; Polymer injection; Polymer layers; Polymer LEDs
- Issue Date
- WILEY-V C H VERLAG GMBH
- ADVANCED FUNCTIONAL MATERIALS, v.19, no.13, pp.2130 - 2136
- Here, the use of metal oxide layers both for charge transport and injection into an emissive semiconducting polymer and also for the control of the in-plane waveguided optical modes in light-emitting diodes (LEDs) is reported. The high refractive index of zinc oxide is used to confine these modes away from the absorbing electrodes, and include a nano-imprinted grating in the polymer layer to introduce distributed feedback and enhance optical out-coupling. These structures show a large increase in the luminescence efficiency over conventional devices, with photoluminescence efficiency increased by up to 45%. Furthermore, optically-pumped lasing in hybrid oxide polymer LEDs is demonstrated. A tuneable lasing emission is also obtained in a single device structure by employing a graduated thickness of a zinc oxide inter-layer. This demonstrates the scope for using such architectures to improve the external efficiency of organic semiconductor LEDs, and opens new possibilities for the realization of polymer injection lasers.
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