Organic light-emitting device based on LSMO

Organic Light Emitting Device(OLED) has been a promising new research area that has received a lot of attention in the recent. In this paper,the OLED was fabricated using spin LSMO substrate. The electrode was made of La1-xSrxMnO3(LSMO) thin films by RF magnetron sputtering with SrTiO3 (100) substrate. In order to increase light transmittance ratio of LSMO film, the substrate was double-sided polished. The structure was LSMO/NPB/Alq3/CsF/Mg:Ag. Light was emitted at above 14 V. The brightness of device was the most at 25 V. The characteristic brightness, voltage and current of these devices were investigated with the magnetic field. The brightness of device was improved 10% with 150 mT. The photovoltaic character was little affected by the magnetic field in the device using LSMO substrate. This phenomenon was related on the ratio of single exciton and triplet exciton in the emissive layer. it would then be possible to preferentially form triplets or singlets by controlling the spin polarizations of the injected carriers. As Alq3 belonged to singlet materials, the brightness of device was improved.