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Bright Light Emission of a Single Polythiophene Nanotube Strand with a Nanometer‐scale Metal Coating

The development of new forms of organic luminescent materials to increase light emitting efficiency is critical to the fabrication of more efficient organic light-emitting diodes (OLEDs). The photoluminescence (PL) efficiency of p-conjugated organic molecules and polymer materials can be enhanced by an increase in singlet excitons, a morphological improvement with reduction of trap sites, the confinement effect of excitons, etc. [1–3] A triplet-state emission can occur in the light-emitting organic materials with a phosphorescence sensitizer. [4,5] For the fabrication of more efficient OLEDs, the mobility of an electron and a hole should be balanced, because the electron mobility of p-conjugated polymers is 10 2 to 10 3 times lower than the hole mobility. [6] OLEDs with a multilayered structure have been fabricated for bright light emission, white light emission, and/or color tuning. [7–9] Hybrid nanostructures of light-emitting polymers with a nanometer-scale metal coating or vice versa can be utilized for the increase of PL efficiency based upon surface plasmon (SP) effects. The SPs are excited by the interaction between an incident visible light and free charge carriers on metal surfaces. [10,11] The PL of the hybrid nanostructures of a lightemitting polymer (LEP) and inorganic metal can be enhanced when the energy of the SP matches the emitted photon energy of the LEP, which results in resonance that can introduce energy and/or charge transfer. This contributes to the improvement in the emission efficiency of LEP. The metal-enhanced