White OLEDs have potential
applications for backlighting display and general illumination
because of their cost-effective fabrication [1–4], high light-emitting efficiency [5–8] and low-energy consumption [9–12].
Therefore, over the past decades, extensive studies have been performed on the development of white OLED [13–16]. It is not easy to
fabricate a pure white OLED because of required appropriate multiemission and emissive intensity, so, there is much work for the
preparations of pure white OLEDs. The previous reported white
OLEDs were based on phosphors, such as iridium or platinum complexes. Although the phosphor-based OLED had high light-emitting
efficiencies, they showed impure emissions. For example, Williams
White OLEDs have potentialapplications for backlighting display and general illuminationbecause of their cost-effective fabrication [1–4], high light-emitting efficiency [5–8] and low-energy consumption [9–12].Therefore, over the past decades, extensive studies have been performed on the development of white OLED [13–16]. It is not easy tofabricate a pure white OLED because of required appropriate multiemission and emissive intensity, so, there is much work for thepreparations of pure white OLEDs. The previous reported whiteOLEDs were based on phosphors, such as iridium or platinum complexes. Although the phosphor-based OLED had high light-emittingefficiencies, they showed impure emissions. For example, Williams
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