Application of the concept of three-color (red (R), green (G), and blue (B)) light-mixing to obtain white light is the most suitable way to realize white-light-emitting devices with very high color-rendering indices (CRI). White-light-emitting devices based on the three-color-mixing method could be used to create lighting and display technologies. Here, white-light-emitting electrochemical cells (LECs) with very high CRIs are reported, which were fabricated by using blend films composed of a fluorescent π-conjugated polymer (FCP), poly(9,9-dioctylfluorene-co-benzothiadiazole) (PFBT), and a phosphorescent iridium complex, [Ir(ppy)2 (biq)]+ (PF6 )- (where (ppy)- =2-phenylpyridinate and biq=2,2'-biquinoline). The LECs fabricated with PFBT, the benzothiadiazole content of which is 0.01 mol %, showed blue electroluminescence (EL) emission originating from the fluorene segments and green EL emission from the benzothiadiazole units simultaneously. White LECs were then realized by adding red-emitting Ir complexes as guest molecules to the blue-green-emitting PFBT. By optimizing the proportions of the PFBT and Ir complexes in the active layers (PFBT/[Ir(ppy)2 (biq)]+ (PF6 )- =1:0.2 (mass ratio)), white-light emission with Commission Internationale de l'Eclairage (CIE) coordinates of (0.29, 0.34) and a very high CRI value of 91.5 was achieved through RGB color-mixing. It was noted that the emission mechanism was based on Förster resonance energy transfer and Dexter energy transfer from excited PFBT to [Ir(ppy)2 (biq)]+ (PF6 )- . The utilization of LECs based on blue-green FCPs and red Ir complexes looks very promising for the prospect of realizing white-light-emitting devices with very high CRIs.

中文翻译：

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基于蓝绿色荧光聚芴和红磷铱配合物的具有很高显色指数的聚合物基白光电化学电池。

应用三色（红（R），绿（G）和蓝（B））光混合的概念以获得白光是实现具有非常高色彩的白光发射器件的最合适方法，渲染指数（CRI）。基于三色混合法的发白光器件可用于创建照明和显示技术。在这里，报道了具有非常高的CRI的发白光的电化学电池（LEC），其是通过使用由荧光π共轭聚合物（FCP），聚（9,9-二辛基芴-共苯并噻二唑）组成的共混膜制成的（PFBT）和磷光铱络合物[Ir（ppy）2（biq）] +（PF6）-（其中（ppy）-= 2-苯基吡啶鎓和biq = 2,2'-联喹啉）。用PFBT制造的LEC，其苯并噻二唑含量为0.01 mol％，同时显示出来自芴链段的蓝色电致发光（EL）发射和来自苯并噻二唑单元的绿色EL发射。然后通过将发红光的Ir配合物作为客体分子添加到发蓝绿的PFBT中来实现白色LEC。通过优化有源层中PFBT和Ir配合物的比例（PFBT / [Ir（ppy）2（biq）] +（PF6）-= 1：0.2（质量比）），国际照明委员会的白光发射l'Eclairage（CIE）坐标为（0.29，0.34），并且通过RGB颜色混合获得了非常高的CRI值91.5。注意到，发射机理基于从激发的PFBT到[Ir（ppy）2（biq）] +（PF6）-的福斯特共振能量转移和德克斯特能量转移。