State Key Laboratory for Mesoscopic Physics, Department of Physics, Peking University, Beijing, PR China.
Adv Mater. 2011 Feb 22;23(8):926-52. doi: 10.1002/adma.201003128. Epub 2010 Oct 28.
Although organic light-emitting devices have been commercialized as flat panel displays since 1997, only singlet excitons were emitted. Full use of singlet and triplet excitons, electrophosphorescence, has attracted increasing attentions after the premier work made by Forrest, Thompson, and co-workers. In fact, red electrophosphorescent dye has already been used in sub-display of commercial mobile phones since 2003. Highly efficient green phosphorescent dye is now undergoing of commercialization. Very recently, blue phosphorescence approaching the theoretical efficiency has also been achieved, which may overcome the final obstacle against the commercialization of full color display and white light sources from phosphorescent materials. Combining light out-coupling structures with highly efficient phosphors (shown in the table-of-contents image), white emission with an efficiency matching that of fluorescent tubes (90 lm/W) has now been realized. It is possible to tune the color to the true white region by changing to a deep blue emitter and corresponding wide gap host and transporting material for the blue phosphor. In this article, recent progresses in red, green, blue, and white electrophosphorescent materials for OLEDs are reviewed, with special emphasis on blue electrophosphorescent materials.
虽然有机发光器件自 1997 年以来已经商业化用于平板显示器，但仅发射单重激子。在 Forrest、Thompson 和同事们的开创性工作之后，电致磷光（利用单重态和三重态激子）的充分利用吸引了越来越多的关注。事实上，红色电致磷光染料自 2003 年以来已用于商业手机的次显示器。高效的绿色磷光染料目前正在商业化中。最近，蓝色磷光也已接近理论效率，这可能克服了全色显示和磷光材料白光光源商业化的最后障碍。通过结合高效磷光体的光取出结构（如图表目录所示），现已实现与荧光灯（90 lm/W）效率相匹配的白色发射。通过改用深蓝色发射器以及相应的宽能隙主体和蓝色磷光体的传输材料，可以将颜色调至真正的白色区域。本文综述了 OLED 中红色、绿色、蓝色和白色电致磷光材料的最新进展，特别强调了蓝色电致磷光材料。
