Lee Dong Hyung, Lee Seok Jae, Koo Ja-Ryong, Lee Ho Won, Shin Hyun Su, Lee Song Eun, Kim Woo Young, Lee Kum Hee, Yoon Seung Soo, Kim Young Kwan
J Nanosci Nanotechnol. 2014 Aug;14(8):5802-6. doi: 10.1166/jnn.2014.8319.
We investigated blue fluorescent organic light-emitting diode (OLED) with a charge control layer (CCL) to produce high efficiency and improve the half-decay lifetime. Three types of devices (device A, B, and C) were fabricated following the number of CCLs within the emitting layer (EML), maintaining the thickness of whole EML. The CCL and host material, 2-methyl-9,10-di(2-naphthyl)anthracene, which has a bipolar property, was able to control the carrier movement with ease inside the EML. Device B demonstrated a maximum luminous efficiency (LE) and external quantum efficiency (EQE) of 9.19 cd/A and 5.78%, respectively. It also showed that the enhancement of the half-decay lifetime, measured at an initial luminance of 1,000 cd/m2, was 1.5 times longer than that of the conventional structure. A hybrid white OLED (WOLED) was also fabricated using a phosphorescent red emitter, bis(2-phenylquinoline)-acetylacetonate iridium III doped in 4,4'-N,N'-dicarbazolyl-biphenyl. The property of the hybrid WOLED with CCL showed a maximum LE and an EQE of 13.46 cd/A and 8.32%, respectively. It also showed white emission with Commission International de L'Éclairage coordinates of (x = 0.41, y = 0.33) at 10 V.
我们研究了带有电荷控制层（CCL）的蓝色荧光有机发光二极管（OLED），以实现高效率并延长半衰寿命。根据发光层（EML）内CCL的数量制作了三种类型的器件（器件A、B和C），同时保持整个EML的厚度不变。CCL与具有双极性特性的主体材料2-甲基-9,10-二（2-萘基）蒽能够轻松控制EML内部的载流子移动。器件B的最大发光效率（LE）和外量子效率（EQE）分别为9.19 cd/A和5.78%。在初始亮度为1000 cd/m²时测量，其半衰寿命的增强比传统结构长1.5倍。还使用掺杂在4,4'-N,N'-二咔唑基联苯中的磷光红色发射体双（2-苯基喹啉）-乙酰丙酮铱III制作了一种混合白色OLED（WOLED）。带有CCL的混合WOLED的性能分别显示出最大LE为13.46 cd/A和EQE为8.32%。在10 V时，其还呈现出国际照明委员会坐标为（x = 0.41，y = 0.33）的白色发射。
