Color stable multilayer all-phosphor white organic light-emitting diodes with excellent color quality
Color stable multilayer all-phosphor white organic light-emitting diodes with excellent color quality
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DOI：
10.1016/j.orgel.2013.04.039
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发表时间：
2013-08
影响因子：
3.2
通讯作者：
Shiming Zhang;Shouzhen Yue;Qingyang Wu;Zhensong Zhang;Y. Chen;Xuehui Wang;Ziyang Liu;Guohua Xie;Qin Xue;Dalong Qu;Yi Zhao;Shiyong Liu
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文献类型：
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作者：
Shiming Zhang;Shouzhen Yue;Qingyang Wu;Zhensong Zhang;Y. Chen;Xuehui Wang;Ziyang Liu;Guohua Xie;Qin Xue;Dalong Qu;Yi Zhao;Shiyong Liu
全荧光粉白色有机电致发光二极管(WOLED)的颜色稳定性至关重要，这是在磷光体WOLED技术广泛应用之前必须克服的挑战。此外，颜色稳定的全荧光粉WOLED还应同时提供高显色指数(CRI)和理想的相关色温(CCT)，以使该技术具有相对于其他替代技术(如无机LED)的竞争力。在这项工作中，我们通过引入三(苯基吡唑)Ir[Ir(Ppz)3]作为中间层，展示了一系列具有两个发射体(蓝色和黄色)、三个发射体(蓝色、绿色/红色和黄色)和四个发射体(蓝色、绿色、黄色和红色)的彩色稳定全磷光体WOLED。结果表明，合适的Ir(Ppz)3中间层厚度不仅可以控制激子在发射区的分布，而且可以提高光谱的稳定性。特别是，一种高效的双中间层四色器件，在与照明相关的亮度为100cdm-2和1000cdm-2时，获得了相当高的CRI为92和90，理想的CCT分别为3703K和3962K，非常适合室内照明应用。通过进一步采用合适的宿主来调节载流子注入，最终获得了具有合适CRI的超高稳定四色器件。
The color stability of all-phosphor white organic light-emitting diodes (WOLEDs) is crucial and remains a challenge that must be overcome before the wide application of phosphor WOLEDs technology. Besides, color stable all-phosphor WOLEDs should also offer high color rendering index (CRI) and ideal correlated color temperature (CCT) simultaneously to make the technology competitive against other alternative technologies such as inorganic LEDs. In this work, we demonstrate a series of color stable all-phosphor WOLEDs with two emitters (blue and yellow), three emitters (blue, green/red, and yellow) and four emitters (blue, green, yellow and red) by introducing tris (phenylpyrazole) Iridium [Ir(ppz)3] as interlayer. The results show that appropriate thickness of Ir(ppz)3interlayer not only can control exciton distribution in the emission zone, but also can improve the spectra stability. In particular, one efficient four-color device with double-interlayer yields fairly high CRI of 92 and 90, ideal CCT of 3703K and 3962K at illumination-relevant luminance of 100cdm–2and 1000cdm–2, respectively, which is very appropriate to indoor lighting application. By further employing appropriate hosts to regulate the carrier injection, ultrahigh stable four-color devices with applicable CRI are finally achieved.