科研之友
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摘要
Solar-cell-integrated organic light-emitting diodes (OLEDs) were fabricated with both high contrast ratio and energy-recycling ability. However, the luminous efficiency of the integrated devices is reduced to 50% of that of conventional top-emitting OLEDs. A novel structure to recover the luminous efficiency from 50% to near 85% by applying a distributed Bragg reflector (DBR) made of 20 layers of GaN/AlN was demonstrated. It saves about 40% of the electric power than that of a device without a DBR. The contrast ratio remains high compared to that of conventional OLEDs. In this paper, simulations were conducted first to prove our models and assumptions. Then, two types of thin-film solar cells - CdTe and CIGS solar cells - were used. They had different contrast ratios as well as viewing-angle properties. Finally, the emission spectrum was calculated to be 11 nm FWHM, which is narrower than that for the emission spectrum of a typical microcavity OLED and has the advantage of having saturated colors.
- 出版日期2011-11
