Improving lifetimes and efficiencies of blue organic light-emitting diodes is clearly a scientific challenge. Towards solving this challenge, we propose a unicolored phosphor-sensitized fluorescence approach, with phosphorescent and fluorescent emitters tailored to preserve the initial color of phosphorescence. Using this approach, we design an efficient sky-blue light-emitting diode with radiative decay times in the submicrosecond regime. By changing the concentration of fluorescent emitter, we show that the lifetime is proportional to the reduction of the radiative decay time and tune the operational stability to lifetimes of up to 320 h (80% decay, initial luminance of 1000 cd/m2). Unicolored phosphor-sensitized fluorescence provides a clear path towards efficient and stable blue light-emitting diodes, helping to overcome the limitations of thermally activated delayed fluorescence.
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机译：延长蓝色有机发光二极管的寿命和效率显然是一项科学挑战。为了解决这一挑战，我们提出了一种单色荧光粉敏化的荧光方法，其磷光和荧光发射体经过定制以保留磷光的初始颜色。使用这种方法，我们设计了一种高效的天蓝色发光二极管，其辐射衰减时间在亚微秒范围内。通过改变荧光发射体的浓度，我们表明寿命与辐射衰减时间的减少成正比，并将操作稳定性调节至高达320 h的寿命（衰减80％，初始亮度为1000 cd / m 2 ）。单色荧光粉敏化的荧光提供了通往高效，稳定的蓝色发光二极管的清晰途径，有助于克服热激活延迟荧光的局限性。
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