(Color online) (a) Schematic structure of the five OLEDs, labeled as D1, D2, D3, D4, and D5; (b) the proposed energy-level diagram of D1. The density of electrons (●) and holes (엯) shows the carrier distribution in D1; downward arrows show the recombination and emission zones.
(Color online) The current density and luminance vs the applied voltage of device 1 (D1). The inset is the curve of this device.
(Color online) (a) The EL spectra of D1 at driving voltages of 10, 11, 11.5, 12, 12.25, 12.5, and ; (b) the normalized EL spectra of D1, D2, D3, D4, and D5. The EL spectrum of D1 is at . Others are spectra with the highest luminance of D2, D3, D4, and D5. The spectra of these four devices do not vary with the voltage significantly.
(Color online) The luminance-voltage relationships of the five OLEDs; the inset shows luminance-current density curves of the devices.
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