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The device structure of tandem OLEDs and the molecular structures of DCJTB and ADN.
The normalized EL spectra of device 1 (solid line), device 2 (dot line), and device 3 (dash line) at a bias.
The normalized EL spectra of tandem device 1 at different applied voltages.
The EL performance of device 1 (triangle), device 2 (square), and device 3 (circle): (a) current-voltage, (b) brightness-current, (c) current efficiency–current, and (d) power efficiency–current.
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