次波長金屬光柵應用於有機發光二極體與光伏整合元件之效能提升

有機發光二極體與光伏整合元件(photovoltaic-device-integrated organic light emitting diode, PVOLED)有助於在外界環境光入射至元件時，藉由太陽能電池幫助吸收環境光，降低其反射造成顯示器對比度下降之問題，另一方面，環境光的能量可以被回收供給顯示器作發電之使用。然而，此設計揭示了另一個問題，有機發光二極體之自發光光源亦會被太陽能電池吸收，造成整體出光效率降低。為了解決此問題，之前文獻提出了在有機發光二極體與太陽能電池之介面設計光學濾波器的概念，設計使濾波器的反射中心波長和半高全寬與PVOLED自發光光源相似，以提高PVOLED出光效率並且維持對比度提升之優點。之前文獻曾採用的光學濾波器有布拉格反射器和二維導模共振濾波器，獨立設計於有機發光二極體和太陽能電池之間。本論文設計了一維雙重功能之次波長金屬光柵與PVOLED作結合，利用調變金屬光柵之寬度、週期，使之在PVOLED自發光頻譜範圍能有效達到濾波效果，不僅將保有原本二維導模共振濾波器增強PVOLED出光效率及對比度提升之優點，亦可作為有機發光二極體與太陽能電池之共用電極以及彩色濾波器之雙重功能，並且針對此模型提出新的模擬方法及計算公式。最後，加入介電層(Dielectric Layer)來幫助藍光、綠光、紅光PVOLED之效能提升，使得PVOLED發展更具突破性。

關鍵字

有機發光二極體與光伏整合元件；導模共振濾波器；次波長金屬光柵；出光效率；對比度

並列摘要

OLEDs have been reported being integrated with photovoltaic devices as tandem structures. In this way, the tandem structure of the devices can absorb and induce destructive interference of the incident light due to the integrated solar cell that can reduce the ambient light reflection and achieve the improvement of the contrast ratio of OLEDs. In addition, the ambient light can be recycled into energy at the same time. However, this device reveals one problem, namely that the total brightness of OLEDs is decreased by integrated solar cells. In order to solve this problem, previous research designed a distributed Bragg reflector(DBR) and tow-dimensional guided-mode-resonance filters (GMRFs) between OLEDs and solar cells to enhance brightness and maintain the contrast ratio of the OLEDs. In the same vein of previous research, we design one-dimensional dual-function subwavelength metallic gratings to replace the independent DBR and tow-dimensional GMRFs structure. One-dimensional dual-function subwavelength metallic gratings are modified as wavelength selective optical filters in the tandem structure device, which in turn reflect more specific interval of the OLED spectrum and increase the luminous efficiency. In addition, they also can be wavelength selective optical filters which reflect red, green, or blue light depending on the different periods and widths of gratings. By designing the gratings and choosing the thickness of dielectric layer, we successfully improve the luminous efficiency and contrast ratio of conventional PVOLED.

並列關鍵字

photovoltaic integrated organic light-emitting diodes(PV-OLEDs) ； guide mode resonance filter(GMRF) ； subwavelength grating ； dielectric layer ； luminous efficiency ； contrast ratio

參考文獻

[1]Hartmut Yersin, “Triplet Emitters for OLED Applications. Mechanisms of Exciton Trapping and Control of Emission Properties”,Top Curr Chem 241:pp.1-26, 2004.

[10]Ranbir Singh, K.N. Narayanan Unni, Ankur Solanki, Deepak, “Improving the contrast ratio of OLED displays: An analysis of various techniques”, Optical Materials 34 ,2012.

[11]C.-J. Yang, T.-Y. Cho, C.-L. Lin and C.-C. Wu, “Organic light-emitting devices integrated with solar cells: High contrast and energy recycling,” Applied Physics Letters, 90: pp. 173507-1–173507-3,2007.

[12]C.-Y. Yang, C.-L. Lin, C.-C. Wu, Y.-H. Yeh, C.-C. Cheng, Y.-H. Kuo and T.-H. Chen, “Energy-recycling pixel for active-matrix organic light-emitting diode display,” Applied Physics Letters, 90: pp. 233512-1–233512-3, 2007.

[13]Wei-En Hsu and Hoang Yan Lin, “Efficiency Improvement of Photovoltaic Device-Integrated Organic Light Emitting Diode by Applying a Distributed Bragg Reflector”, SID 11 DIGEST, pp.255-258, 2011.

國際替代計量

次波長金屬光柵應用於有機發光二極體與光伏整合元件之效能提升

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