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OLEDs for Lighting

机译：照明用OLED

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Currently, all device designs for white combinations are being tried out, since each has different strengths and weaknesses. Obviously, the direct combination of monochrome OLEDs into an integrated white one has proven more difficult than anticipated, therefore other designs like stacking or individual pixels are pursued. Those designs can make use of the optimized monochrome OLEDs. So far, all designs work and there is no clear winner yet. Certainly the "best" device design depends also strongly on the application requirements, which will determine parameters like form factor, visual appearance, light quality, pricing etc. It should be noted that all recent record figures are achieved with enhanced light outcoupling, which strongly underlines the importance of this technique for OLEDs. What is needed from research and development to ensure a successful entry of OLEDs into the lighting market? From the performance measures, efficiency and operational lifetime are the most important ones. Here a stable phosphorescent blue emitter (with a colour point of about 0.15,0.2 to cover the white region fully) is the most urgent requirement. Encouraging news from UDC are pointing towards a possible solution in this area. Generally, OLEDs can profit in almost every respect if more light can be coupled out in a cost-efficient way. For warm white, more efficient red emitters are also high on the wish list since energy wise their contribution to the white mixture is highest. Ways to drive OLEDs at higher luminance levels without extra lifetime penalty are important in order to reduce the area needed for a certain lumen output. Past experience has shown that there has always been a rapid progress in the material development, so we can be confident that this wish list will shrink over the next years. More precisely, it can be expected that solutions for stable phosphorescent blue emitters will be emerging within one year. Over the next two years, efficient fully integrated OLEDs will be developed. In about 3 years time we will see white OLED systems with a CRI > 80, a lifetime > 5000h, a CCT 3000-5000K, and an efficacy of > 50 lm/W. This will put OLEDs in a position where they can start to compete with compact fluorescent lamps in the general lighting market. The road to efficacies of 100 lm/W and beyond depends crucially on much improved light outcoupling and on a careful, complete optimization of all system aspects.
机译：目前，所有白色组合的设备设计都在尝试中，因为每种设计都有各自的优缺点。显然，将单色OLED直接集成为集成的白色OLED已证明比预期的要困难得多，因此，人们追求诸如堆叠或单个像素的其他设计。这些设计可以利用优化的单色OLED。到目前为止，所有设计均有效，尚无明显赢家。当然，“最佳”设备的设计还强烈取决于应用程序的需求，这将决定诸如外形，视觉外观，光质量，价格等参数。应注意的是，所有最近的记录数据都是通过增强的光耦合实现的，强调了该技术对OLED的重要性。为了确保OLED成功进入照明市场，研发需要什么？从性能指标来看，效率和使用寿命是最重要的指标。最紧急的要求是稳定的磷光蓝光发射器（色点约为0.15,0.2，以完全覆盖白色区域）。来自UDC的令人鼓舞的消息指出了在这一领域可能的解决方案。通常，如果可以以具有成本效益的方式耦合出更多的光，则OLED几乎可以在所有方面获利。对于暖白光，更高效的红色发光体在愿望清单中也很高，因为从能量角度而言，它们对白色混合物的贡献最高。为了减小特定流明输出所需的面积，以更高的亮度水平驱动OLED而又不增加使用寿命的方法很重要。过去的经验表明，材料开发一直在快速发展，因此我们可以确信，这一愿望清单将在未来几年内减少。更准确地说，可以预期，稳定的磷光蓝色发射器的解决方案将在一年之内出现。在接下来的两年中，将开发高效的全集成OLED。在大约3年的时间里，我们将看到CRI> 80，寿命> 5000h，CCT 3000-5000K，功效> 50 lm / W的白色OLED系统。这将使OLED处于可以与普通照明市场上的紧凑型荧光灯竞争的地位。达到100 lm / W甚至更高的效率之路，关键取决于大大改善的光输出耦合以及对所有系统方面的仔细，全面的优化。

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