Highly efficient white transparent organic light emitting diodes with nano-structured substrate

• An internal random scattering layer (RSL) was introduced to enhance the light out coupling of transparent white OLEDs.
• By applying RSL, we achieved remarkable total efficiency enhancements in EQE and PE were 177% and 201%, respectively.
• Our approach offers an effective technical method to achieve high efficiency and chromaticity stabilized in transparent OLEDs.

Enhancing outcoupling efficiency and stabilizing emission spectra are of high technical importance in realizing high quality white transparent organic light emitting diodes (TOLEDs). In this work, we demonstrate a random nano-scattering layer (RSL) as a structure which can effectively address those tasks. The RSL contributes to bottom and top emissions by scattering and reflection, respectively. With the use of RSL, we achieved remarkable total efficiency enhancement of 101%. Also, a viewing angle independent stable white spectrum with a color rendering index of 79 was achieved. With its straight forward processing, our RSL can be readily applied to deal with various photonic applications to enhance both efficiency and emission spectra.

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