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

Yi J, Niu Q, Xu W, Hao L, Yang L, Chi L, Fang Y, Huang J, Xia R - Sci Rep (2016)

Bottom Line: 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/cm(2) for ITO/PFO to 26.3 μJ/cm(2) for ITO/PPFN(+)Br(-)/PFO.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory for Organic Electronics &Information Displays (KLOEID) &Institute of Advanced Materials (IAM), Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts and Telecommunications, 9 Wenyuan Road, Nanjing 210023, China.

ABSTRACT
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/cm(2) for ITO/PFO to 26.3 μJ/cm(2) for ITO/PPFN(+)Br(-)/PFO. Furthermore, ASE narrowing displayed at pump energy up to 61.8 μJ/cm(2) 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/cm(2). The optically pumped lasing operation has also been achieved at threshold up to 45 μJ/cm(2) 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.

No MeSH data available.


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(a) The ASE threshold of PFO as a function of the thickness of interlayers. (b) The normalized output intensity of PFO emission versus the pump energy density for various device configurations at optimized interlayer thickness.
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f2: (a) The ASE threshold of PFO as a function of the thickness of interlayers. (b) The normalized output intensity of PFO emission versus the pump energy density for various device configurations at optimized interlayer thickness.

Mentions: PFN+Br−, PPFN+Br− and PEDOT:PSS were investigated as the interlayers to modify the surface of ITO in pursuit of ASE threshold reduction in the device configuration of ITO/interlayer/PFO. The thickness of PFO is fixed at 90 nm. The thickness of interlayers was controlled by solution concentration and spin-coating speed. It was calculated by Beer’s law (see Fig. S5 in SI). The optimization procedure of the interlayers for each device is shown in Fig. S6 in SI. Figure 2a shows the ASE threshold as a function of interlayer thickness for devices ITO/interlayer/PFO. The ASE threshold of the PEDOT:PSS-based device decreases from 150 μJ/cm2 to 94.4 μJ/cm2 (1.6-fold reduction) with the PEDOT:PSS thickness increased to 20 nm, then started to increase as the PEDOT:PSS thickness further increase. Similar trend was observed for PFN+Br−-based device, i.e., a gradual reduction of the ASE threshold with the PFN+Br− thickness increasing up to 13 nm, where the lowest threshold of 62.2 μJ/cm2 (2.4-fold reduction) emerges. Further increase of the PFN+Br− thickness did not contribute to the reduction of the ASE threshold. As for the PPFN+Br−-based devices, with the PPFN+Br− thickness increased to 37 nm, the ASE threshold quickly decreased and the lowest threshold of 26.3 μJ/cm2 (5.7-fold reduction) was obtained, which is comparable with the ASE threshold of glass/PFO although it was still higher than that of quartz/PFO. We note that further increasing the thickness of interlayer beyond the optimized thickness lead to ASE threshold increase for all the three interlayers. This could be caused by the absorption of the interlayer (see Fig. S2 in SI) and/or the film quality of the interlayer became poor. Figure 2b shows the output intensity versus the pump energy density for various device configurations at optimized thickness of each interlayer.


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

Yi J, Niu Q, Xu W, Hao L, Yang L, Chi L, Fang Y, Huang J, Xia R - Sci Rep (2016)

(a) The ASE threshold of PFO as a function of the thickness of interlayers. (b) The normalized output intensity of PFO emission versus the pump energy density for various device configurations at optimized interlayer thickness.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4863163&req=5

f2: (a) The ASE threshold of PFO as a function of the thickness of interlayers. (b) The normalized output intensity of PFO emission versus the pump energy density for various device configurations at optimized interlayer thickness.
Mentions: PFN+Br−, PPFN+Br− and PEDOT:PSS were investigated as the interlayers to modify the surface of ITO in pursuit of ASE threshold reduction in the device configuration of ITO/interlayer/PFO. The thickness of PFO is fixed at 90 nm. The thickness of interlayers was controlled by solution concentration and spin-coating speed. It was calculated by Beer’s law (see Fig. S5 in SI). The optimization procedure of the interlayers for each device is shown in Fig. S6 in SI. Figure 2a shows the ASE threshold as a function of interlayer thickness for devices ITO/interlayer/PFO. The ASE threshold of the PEDOT:PSS-based device decreases from 150 μJ/cm2 to 94.4 μJ/cm2 (1.6-fold reduction) with the PEDOT:PSS thickness increased to 20 nm, then started to increase as the PEDOT:PSS thickness further increase. Similar trend was observed for PFN+Br−-based device, i.e., a gradual reduction of the ASE threshold with the PFN+Br− thickness increasing up to 13 nm, where the lowest threshold of 62.2 μJ/cm2 (2.4-fold reduction) emerges. Further increase of the PFN+Br− thickness did not contribute to the reduction of the ASE threshold. As for the PPFN+Br−-based devices, with the PPFN+Br− thickness increased to 37 nm, the ASE threshold quickly decreased and the lowest threshold of 26.3 μJ/cm2 (5.7-fold reduction) was obtained, which is comparable with the ASE threshold of glass/PFO although it was still higher than that of quartz/PFO. We note that further increasing the thickness of interlayer beyond the optimized thickness lead to ASE threshold increase for all the three interlayers. This could be caused by the absorption of the interlayer (see Fig. S2 in SI) and/or the film quality of the interlayer became poor. Figure 2b shows the output intensity versus the pump energy density for various device configurations at optimized thickness of each interlayer.

Bottom Line: 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/cm(2) for ITO/PFO to 26.3 μJ/cm(2) for ITO/PPFN(+)Br(-)/PFO.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory for Organic Electronics &Information Displays (KLOEID) &Institute of Advanced Materials (IAM), Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts and Telecommunications, 9 Wenyuan Road, Nanjing 210023, China.

ABSTRACT
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/cm(2) for ITO/PFO to 26.3 μJ/cm(2) for ITO/PPFN(+)Br(-)/PFO. Furthermore, ASE narrowing displayed at pump energy up to 61.8 μJ/cm(2) 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/cm(2). The optically pumped lasing operation has also been achieved at threshold up to 45 μJ/cm(2) 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.

No MeSH data available.


Related in: MedlinePlus