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The coated porous polyimide layers for optical scattering films

1 Center for Nano-Photonics Convergence Technology, Korea Institute of Industrial Technology (KITECH), Gwangju, 61012, Korea
2 School of Chemical Engineering, Chonnam National University Gwangju, 61186, Korea
3 Department of Electrical Energy Engineering, Keimyung University, Daegu, 42601, Korea
4 Department of Display Engineering, Pukyong National University, Busan, 48513, Korea

Topical Section: Porous Materials

We have investigated the optical scattering characteristic of the air-void micro-structure of air-voids of the porous polyimide (PI) layer prepared from a simple polyimide-precursor coating and the immersion precipitation method. For the careful control or tune of the generated pore-structure, the content of polar aprotic solvent in polar protic non-solvent bath was adjusted during the pore-generation process. To account the correlation between the generated micro-structure of a porous polymer layer and its optical scattering property, the optical haze values were calculated and compared with the measured total transmittance and diffuse transmittance values. And the calculated average optical haze value decreased from 0.88 to 0.53 as increasing the content of polar aprotic solvent in the coagulation bath. In addition, the light scattering mechanism was proposed for a prepared porous polymer film consisting of air-voids inside the polymer media and the rough surface at the ambient interface. Finally, for an analytical explanation, we also introduced Mie scattering and Scalar surface scattering which explains the light scattering inside pore structure as well as at the rough surface, respectively. Based on our systematic approach, it can be said that the net power of light scattering was the sum of Mie scattering and the surface scattering.
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Keywords porous polymer layer; optical scattering; haze film; immersion precipitation; polyimide

Citation: Hyeck Go, Eun-Mi Han, Moon Hee Kang, Yong Hyun Kim, Changhun Yun. The coated porous polyimide layers for optical scattering films. AIMS Materials Science, 2018, 5(6): 1102-1111. doi: 10.3934/matersci.2018.6.1102

References

  • 1. Chang HW, Lee J, Hofmann S, et al. (2013) Nano-particle based scattering layers for optical efficiency enhancement of organic light-emitting diodes and organic solar cells. J Appl Phys 113: 204502-1–204502-8.    
  • 2. Song J, Kim KH, Kim E, et al. (2018) Lensfree OLEDs with over 50% external quantum efficiency via external scattering and horizontally oriented emitters. Nat Commun 9: 3207–3217.    
  • 3. Xue J, Gu Y, Shan Q, et al. (2017) Constructing Mie-Scattering Porous Interface-Fused Perovskite Films to Synergistically Boost Light Harvesting and Carrier Transport. Angew Chem Int Ed 56: 5232–5236.    
  • 4. Nirmal A, Kyaw AKK, Sun XW, et al. (2014) Microstructured porous ZnO thin film for increased light scattering and improved efficiency in inverted organic photovoltaics. Opt Express 22: A1412–A1421.    
  • 5. Hsu CW, Zhen B, Qiu W, et al. (2014) Transparent displays enabled by resonant nanoparticle scattering. Nat Commun 5: 3152–3158.    
  • 6. Kim E, Cho H, Kim K, et al. (2015) A Facile Route to Efficient, Low-Cost Flexible Organic Light-Emitting Diodes: Utilizing the High Refractive Index and Built-In Scattering Properties of Industrial-Grade PEN Substrates. Adv Mater 27: 1624–1631.    
  • 7. Bathelt R, Buchhauser D, Gärditz C, et al. (2007) Light extraction from OLEDs for lighting applications through light scattering. Org Electron 8: 293–299.    
  • 8. Malinka AV (2014) Light scattering in porous materials: Geometrical optics and stereological approach. J Quant Spectrosc Ra 141: 14–23.    
  • 9. Penttilä A, Lumme K (2009) The effect of the properties of porous media on light scattering. J Quant Spectrosc Ra 110: 1993–2001.    
  • 10. Koh TW, Spechler JA, Lee KM, et al. (2015) Enhanced outcoupling in organic light-emitting diodes via a high-index contrast scattering layer. ACS Photonics 2: 1366–1372.    
  • 11. Go H, Koh TW, Jung H, et al. (2017) Enhanced light-outcoupling in organic light-emitting diodes through a coated scattering layer based on porous polymer films. Org Electron 47: 117–125.    
  • 12. Strey R (1994) Microemulsion microstructure and interfacial curvature. Colloid Polym Sci 272: 1005−1019.
  • 13. LEE KM, Fardel R, Zhao L, et al. (2017) Enhanced outcoupling in flexible organic light-emitting diodes on scattering polyimide substrates. Org Electron 51: 471−476.
  • 14. Niesen B, Rand BP (2009) Thin Film Metal Nanocluster Light-Emitting Devices. Adv Mater 26: 1446–1449.
  • 15. Kim YD, Kim JY, Lee HK, et al. (1999) Formation of polyurethane membrane by immersion precipitation. II. Morphology formation. J Appl Polym Sci 74: 2124–2132.
  • 16. Reuvers AJ, van den Berg JWA, Smolders CA (1987) Formation of membranes by means of immersion precipitation: Part I. A model to describe mass transfer during immersion precipitation. J Membrane Sci 34: 45–65.
  • 17. Reuvers AJ, van den Berg JWA, Smolders CA (1987) Formation of membranes by means of immersion precipitation: Part II. The mechanism of formation of membranes prepared from the system cellulose acetate-acetone-water. J Membrane Sci 34: 67–86.
  • 18. Kelly K, Coronado E, Zhao L, et al. (2003) The Optical Properties of Metal Nanoparticles:  The Influence of Size, Shape, and Dielectric Environment. J Phys Chem B 107: 668–677.
  • 19. Zeman M, van Swaaij R, Metselaar JW, et al. (2000) Optical modeling of solar cells with rough interfaces: Effect of back contact and interface roughness. J Appl Phys 88: 6436–6443.    

 

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