Feeling blue? Blue phosphors for OLEDs
Feeling blue? Blue phosphors for OLEDs
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DOI：
10.1016/s1369-7021(11)70211-5
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发表时间：
2011-10-01
期刊：
影响因子：
24.2
通讯作者：
Chi, Yun
中科院分区：
文献类型：
--
作者：
Fu, Hungshin;Cheng, Yi-Ming;Chi, Yun
有机发光二极管（OLED）在过去二十多年中引起了极大的关注。自 Tang 和 Van Slyke(1) 具有影响力和开创性的工作以来，OLED 一直被视为下一代平板显示 (FPD) 技术，因为它们为自发光显示器提供了多种优势，例如宽视角（几乎 180 度）、薄面板（< 2 毫米）、重量轻、快速响应时间（微秒或更短）、明亮的发射和高对比度。此外，它们可以在柔性基板上制造，因此用途广泛。事实上，OLED 已经应用于一些商业产品，如 MP3 播放器、手机、数码相机、PDA 等。SONY XEL-1 是世界上第一台商用 OLED 电视，具有 3 毫米厚的面板，以及令人惊叹的图像对比度、亮度和色彩。随后，LG 宣布推出 31 英寸原型机，并计划在 2012 年生产 55 英寸电视，而三星则在 2011 年推出 42 英寸原型机。 OLED 除了主要应用于显示技术外，还用作照明光源，即白光发光 OLED，或称 WOLED(2)。出于照明目的，WOLED 必须满足严格的要求。为了与作为照明光源的荧光灯管竞争，功率效率 > 70 lm/W 是首选，并且使用寿命必须至少为 10 000 h @ 1000 cd/m(2)，显色指数 (CRI) 大于 80%。对于OLED显示器来说，预计拐点将在2014年左右，届时生产良率预计将大于70%。 OLED 的成本效益、亮度和便携性将成为 LCD 产品的主要威胁(3)。
Organic light emitting diodes (OLEDs) have drawn great attention in the past two (plus) decades. Ever since the influential and groundbreaking work by Tang and Van Slyke(1) OLEDs have been viewed as the next generation flat panel display (FPD) technology as they offer several advantages for self-emitting displays, such as a wide viewing angle (almost 180 degrees), a thin panel (< 2 mm), light weight, a fast response time (microseconds and less), bright emission, and high contrast. Moreover, they can be made on flexible substrates, and are thus highly versatile. In reality, OLEDs have already been incorporated into some commercial products, like MP3 players, mobile phones, digital cameras, PDAs, etc. The SONY XEL-1 was the world's first commercial OLED TV, featuring a 3 mm thick panel, as well as breathtaking image contrast, brightness, and color. Later on, LG announced the debut of a 31 '' prototype and planned to have a 55 '' TV on the production line in 2012, while Samsung introduced a 42 '' prototype in 2011. In addition to its main application in display technology, OLEDs are also used as a lighting source, namely, as white-emitting OLEDs, or WOLEDs(2). For lighting purposes, WOLEDs have to meet stringent requirements. To compete with the fluorescent tube as a lighting source, a power efficiency of > 70 lm/W is preferred and the lifetime must be at least 10 000 h @ 1000 cd/m(2), with a color rendering index (CRI) greater than 80 %. For the OLED display, it is expected that the turning point will be around 2014 when the yield rate of production is expected to be greater than 70 %. The consequent cost-effectiveness, brightness, and portability of the OLED will represent a major threat to LCD products(3).