Efficient Single Active Layer Electrophosphorescent White Polymer Light‐Emitting Diodes
Efficient Single Active Layer Electrophosphorescent White Polymer Light‐Emitting Diodes
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DOI：
10.1002/adma.200701329
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发表时间：
2008-02
影响因子：
29.4
通讯作者：
Hongbin Wu;Jianhua Zou;Feng-you Liu;Wen Wang;A. Mikhailovsky;G. Bazan;Wei Yang;Yong Cao
中科院分区：
文献类型：
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作者：
Hongbin Wu;Jianhua Zou;Feng-you Liu;Wen Wang;A. Mikhailovsky;G. Bazan;Wei Yang;Yong Cao
白光有机电致发光器件(WOLED)因其在全彩色平板显示器、液晶显示器背光源和固态光源等方面的潜在应用，引起了科学界和工业界的广泛关注。[1，2]为了实现白色发射，通常需要三种红、绿和蓝(RGB)原色或两种互补色的混合。已经报道了实现WOLED的各种方法，包括能够顺序能量转移的多层结构，含有适当比例的RGB磷光或荧光掺杂剂的[3-5]多组分发光层，含有RGB发射物种的[6-14]聚合物共混物，[8-16]电荷转移激基缔合物或激发剂[4，17]，以及利用具有广泛发射的聚合物的单组份层。[18-21]聚合物发光器件(PLED)[8-15]提供溶液处理的优势，包括丝网印刷和喷墨沉积、大面积覆盖和低功耗。然而，与使用真空沉积技术制造的器件相比，白色发射PLED在功率效率(PE)和发光效率(LE)方面的效率较低。例如，真空沉积的WO-LED的效率超过了白炽灯(12-17 lmW-1)。[1]相比之下，据我们所知，最有效的白光PLED在10 lmW-1以下，[12-14]距离固态照明的实际应用还很远。在……里面
White organic light-emitting devices (WOLEDs) have drawn intense attention in both scientific and industrial communities due to their potential applications in full-color flat-panel displays, back-lighting sources for liquid-crystal displays and solid-state lighting sources. [1,2] To achieve white emission, mixtures of the three red, green and blue (RGB) primary colors or two complementary colors, are typically required. Various approaches towards realizing WOLEDs have been re-ported, including multilayer structures capable of sequential energy transfer, [3–5] multiple component emissive layers containing an appropriate ratio of RGB phosphorescent or fluorescent dopants, [6–14] polymer blends containing RGB emitting species, [8–16] charge transfer exciplexes or excimers broad emission [4,17] and single component layers that utilize a polymer with broad emission. [18–21] Polymer light-emitting devices (PLEDs) [8–15] offer the advantages of solution processing, including screen printing and ink-jet deposition, large area coverage, and low power consumption. However, white emission PLEDs are less efficient with respect to power efficiency (PE) and luminous efficiency (LE), when compared with devices fabricated using vacuum-deposition technologies. For example, vacuum deposited WO-LEDs have efficiencies that exceed that of the incandescent light bulb (12–17 lm W –1 ). [1] In contrast, to the best of our knowledge, the most efficient white emission PLEDs are below 10 lm W –1 , [12–14] still far away from practical applications for solid-state lighting. In