Significant Lowering Optical Loss of Electrodes via using Conjugated Polyelectrolytes Interlayer for Organic Laser in Electrically Driven Device Configuration.

Jianpeng Yi,Yueting Fang,Lin Hao,Jinjin Huang,Qiaoli Niu,Lang Chi,Lei Yang,Weidong Xu,Ruidong Xia

doi:10.1038/srep25810

Jianpeng Yi, Yueting Fang + Show 7 more

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https://doi.org/10.1038/srep25810

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One of the challenges toward electrically driven organic lasers is the huge optical loss associated with the contact of electrodes and organic gain medium in device. We demonstrated a significant reduction of the optical loss by using our newly developed conjugated polyelectrolytes (CPE) PPFN+Br− as interlayer between gain medium and electrode. The optically pumped amplified spontaneous emission (ASE) was observed at very low threshold for PFO as optical gain medium and up to 37 nm thick CPE as interlayer in device configuration, c.f., a 5.7-fold ASE threshold reduction from pump energy 150 μJ/cm2 for ITO/PFO to 26.3 μJ/cm2 for ITO/PPFN+Br−/PFO. Furthermore, ASE narrowing displayed at pump energy up to 61.8 μJ/cm2 for device ITO/PEDOT:PSS/PFO/PPFN+Br−/Ag, while no ASE was observed for the reference devices without CPE interlayer at pump energy up to 240 μJ/cm2. The optically pumped lasing operation has also been achieved at threshold up to 45 μJ/cm2 for one-dimensional distributed feedback laser fabricated on ITO etched grating in devices with CPE interlayer, demonstrating a promising device configuration for addressing the challenge of electrically driven organic lasers.

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In recent years, conjugated polyelectrolytes (CPEs) have been employed to modify the energy level of the indium-tinoxide (ITO) or metal electrode, to improve electron injection/extraction ability for organic light emitting devices (OLEDs) and organic solar cells (OSCs)[16,17,18,19,20,21]
Our study shows the PPFN+Br− has blocked light quenching of the metal electrode efficiently, amplified spontaneous emission (ASE) of PFO was observed from device ITO/PEDOT:PSS/PFO/PPFN+Br−/Ag, while no ASE was observed for the reference devices without CPE interlayer at pump energy up to 240 μJ/cm[2]
When PPFN+Br− inserted between Ag and PFO, ASE was achieved at extremely low pump energy (13.3 μJ/cm2)

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In recent years, conjugated polyelectrolytes (CPEs) have been employed to modify the energy level of the indium-tinoxide (ITO) or metal electrode, to improve electron injection/extraction ability for organic light emitting devices (OLEDs) and organic solar cells (OSCs)[16,17,18,19,20,21]. We have studied the ASE threshold in detail at various device configurations with PPFN+Br−, PFNBr and Poly (3,4-ethylenedioxythiophene)/poly (styrenesulfonate) (PEDOT:PSS) as interlayers between electrodes and gain medium. PPFN+Br− was used as interlayer between metal electrode and PFO since it works better than PFN+Br and PEDOT:PSS. Our study shows the PPFN+Br− has blocked light quenching of the metal electrode efficiently, ASE of PFO was observed from device ITO/PEDOT:PSS/PFO/PPFN+Br−/Ag, while no ASE was observed for the reference devices without CPE interlayer at pump energy up to 240 μJ/cm[2]. Following detailed study of ASE threshold on various device configurations, the optically pumped lasing operation has been demonstrated for one-dimensional (1-D) distributed feedback (DFB) laser fabricated on ITO etched grating in a typical device configuration with CPE interlayer.

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