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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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AFM images of (a) bare ITO, (b) ITO/PFN+Br−(14 nm), (c) ITO/ PPFN+Br− (37 nm) and (d) ITO/ PEDOT:PSS (23 nm).
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f3: AFM images of (a) bare ITO, (b) ITO/PFN+Br−(14 nm), (c) ITO/ PPFN+Br− (37 nm) and (d) ITO/ PEDOT:PSS (23 nm).

Mentions: The surface morphology of the devices is believed to be one of the most important elements in optical waveguide. We therefore investigated the morphology of bare ITO and ITO/interlayer by means of atomic force microscope (AFM). Figure 3 is the AFM images of bare ITO and ITO coated with three interlayers at the thickness on which the lowest ASE threshold was achieved. The root mean square roughness (RMS) is 2.5 nm for bare ITO, 2.1 nm for ITO/ PFN+Br− (14 nm), 1.7 nm for ITO/PEDOT:PSS (23 nm) and 1.1 nm for ITO//PPFN+Br− (37 nm). The AFM images clearly show the surface roughness of ITO has been improved by insertion of interlayer. The improved surface morphology certainly reduced the light scattering loss, therefore, lowering the ASE threshold. The most significant improvement of ITO surface morphology was achieved by PPFN+Br− as interlayer. We note the RMS of 23 nm PEDOT:PSS coated ITO is smaller than 14 nm PFN+Br− coated one. However, the device with PEDOT:PSS interlayer exhibited higher ASE threshold with respect to the ASE threshold of the device with PFN+Br− interlayer as shown in Fig. 2a,. One of the reason could be that PEDOT:PSS layer would quench the excitons generated by the gain medium under optically-pumped conditions, therefore, impede the ASE action. Similar phenomenon has been reported in literatures on OLEDs232425.


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)

AFM images of (a) bare ITO, (b) ITO/PFN+Br−(14 nm), (c) ITO/ PPFN+Br− (37 nm) and (d) ITO/ PEDOT:PSS (23 nm).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f3: AFM images of (a) bare ITO, (b) ITO/PFN+Br−(14 nm), (c) ITO/ PPFN+Br− (37 nm) and (d) ITO/ PEDOT:PSS (23 nm).
Mentions: The surface morphology of the devices is believed to be one of the most important elements in optical waveguide. We therefore investigated the morphology of bare ITO and ITO/interlayer by means of atomic force microscope (AFM). Figure 3 is the AFM images of bare ITO and ITO coated with three interlayers at the thickness on which the lowest ASE threshold was achieved. The root mean square roughness (RMS) is 2.5 nm for bare ITO, 2.1 nm for ITO/ PFN+Br− (14 nm), 1.7 nm for ITO/PEDOT:PSS (23 nm) and 1.1 nm for ITO//PPFN+Br− (37 nm). The AFM images clearly show the surface roughness of ITO has been improved by insertion of interlayer. The improved surface morphology certainly reduced the light scattering loss, therefore, lowering the ASE threshold. The most significant improvement of ITO surface morphology was achieved by PPFN+Br− as interlayer. We note the RMS of 23 nm PEDOT:PSS coated ITO is smaller than 14 nm PFN+Br− coated one. However, the device with PEDOT:PSS interlayer exhibited higher ASE threshold with respect to the ASE threshold of the device with PFN+Br− interlayer as shown in Fig. 2a,. One of the reason could be that PEDOT:PSS layer would quench the excitons generated by the gain medium under optically-pumped conditions, therefore, impede the ASE action. Similar phenomenon has been reported in literatures on OLEDs232425.

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