Abstract
A single crystal-based organic light-emitting device (OLED) with intrinsically polarized and color-tunable electroluminescence (EL) has been demonstrated without any subsequent treatment. The polarization ratio of 5:1 for the transversal-electric (TE) and transversal-magnetic (TM) polarization at the emission peak of 575 nm, and 4.7:1 for the TM to TE polarization at the emission peak of 635 nm, respectively, have been obtained. The emitting color is tunable between yellow, yellow-green and orange by changing the polarization angle. The polarized EL and the polarization-induced color tunability can be attributed to the anisotropic microcavity formed by the BP3T crystal with uniaxial alignment of the molecules.
Highlights
The research on organic light-emitting devices (OLEDs) has attracted much attention because of their potential applications in full-color flat panel displays and solid-state lighting[1,2,3,4,5,6]
The PL spectrum is broad for low pump power whereas a strong narrow-band emission of amplified spontaneous emission (ASE) from BP3T single crystals will be observed at 575 nm by increasing the pump energy beyond a certain threshold (Fig. 1c)[26,27,28,29,30,31,32]
The external EL quantum efficiency (EQE) of the crystal-based OLEDs is still low, which may originate from a poor charge balance with different hole and electron mobilities of BP3T16,25,29
Summary
The research on organic light-emitting devices (OLEDs) has attracted much attention because of their potential applications in full-color flat panel displays and solid-state lighting[1,2,3,4,5,6]. Organic single crystals are ideal candidate for the polarized emission due to their intrinsic highly ordered structures with anisotropic properties, so that polarized emission is possible without any subsequent treatment. Organic crystals have been widely used in optoelectronic devices such as optically pumped lasers, organic field-effect transistors (OFETs), light-emitting OFETs and photovoltaic cells, due to their features of highly ordered structure, high thermal stability, and high carrier mobility[17,18,19,20,21,22,23,24]. Uniform carrier injection into the active layer of crystal for high performance and long-term stability of the crystal-based OLEDs. Here we report on organic single-crystal-based OLEDs with intrinsic polarization and tunable color of EL. The polarized EL and the polarization-induced color tunability can be attributed to the anisotropic microcavity formed by the BP3T crystal with uniaxial alignment of the molecules
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