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High efficiency white organic light emitting diodes combining fluorescent and phosphorescent emitter systems

机译:结合荧光和磷光发射器系统的高效白色有机发光二极管

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We report on white organic light emitting diodes with three stacked emitter layers comprising the fluorescent blue emitter Spiro-DPVBi, the phosphorescent green emitter system TCTA:Ir(ppy)_3 and the phosphorescent red emitter system NPB:Ir(MDQ)_2(acac). A thin additional layer of mixed TCTA and TPBi separates the fluorescent and phosphorescent emitting regions, simultaneously confining excitons efficiently and letting electrons and holes easily pass. Furthermore, phosphorescence quenching by Dexter transfer to the non-radiative triplet state of Spiro-DPVBi is suppressed. Devices were optimized to get color coordinates very close to the warm white standard illuminant A. Best devices have a current efficiency of 13.8 cd/A, CIE color coordinates of (0.45, 0.42), and a color rendering index of 91 at a brightness of 1000 cd/m~2. Due to the use of electrically doped charge transport layers, the voltage needed for 1000 cd/m~2 was only 3.0 V, which leads to a power efficiency of 14.4 lm/W assuming Lambertian emission.
机译:我们报告了具有三个堆叠发射器层的白色有机发光二极管,这些发射器层包括荧光蓝色发射器Spiro-DPVBi,磷光绿色发射器系统TCTA:Ir(ppy)_3和磷光红色发射器系统NPB:Ir(MDQ)_2(acac) 。混合的TCTA和TPBi的薄薄附加层将荧光和磷光发射区分开,同时有效地限制了激子,并使电子和空穴容易通过。此外,抑制了通过Dexter转移到Spiro-DPVBi的非辐射三重态的磷光猝灭。对设备进行了优化,以使其颜色坐标非常接近于暖白标准光源A。最佳设备的电流效率为13.8 cd / A,CIE色坐标为(0.45,0.42),在亮度为190时的显色指数为91。 1000 cd / m〜2。由于使用了电掺杂的电荷传输层,因此1000 cd / m〜2所需的电压仅为3.0 V,在假定为朗伯发射的情况下,其功率效率为14.4 lm / W。

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