Department of Chemical Engineering , Kyung Hee University , 1732, Deogyeong-daero , Giheung-gu, Yongin-si , Gyeonggi-do 17104 , Republic of Korea.
LG Display, 1007, Deoguen-ri , Wollong-myeun, Paju-si , Gyeonggi-do 413-779 , Republic of Korea.
ACS Appl Mater Interfaces. 2018 Sep 12;10(36):30022-30028. doi: 10.1021/acsami.8b09013. Epub 2018 Aug 30.
In this study, four emitters of blue light are synthesized by selecting pyrene with its high photoluminescence quantum yield (PLQY) as the core group and variants of the electron-donating diphenylamine (DPA) as side groups. The four compounds have different numbers, sizes, and substitution positions of alkyl groups on the DPA. Each of the four compounds when doped in OLED devices shows a high current efficiency (CE) of over 7 cd A and a high external quantum efficiency (EQE) of over 7.5%. In addition, the compounds yield electroluminescence (EL) spectra showing peaks with narrow full width at half-maximum (fwhm) values of 37-40 nm and hence indicative of high color purity. Moreover, one compound N1,N6-bis(5-( tert-butyl)-2-methylphenyl)-N1,N6-bis(2,4-dimethylphenyl)pyrene-1,6-diamine (3Me-1Bu-TPPDA), shows a very high EQE of 9.25% and a very long lifetime with an LT95 of 471 h.
在这项研究中，选择具有高光致发光量子产率（PLQY）的芘作为核心基团，并选择电子给体二苯胺（DPA）的变体作为侧基，合成了四个蓝光发射器。这四个化合物在 DPA 上具有不同数量、大小和取代位置的烷基。当这四个化合物分别掺杂在 OLED 器件中时，每个化合物都表现出超过 7 cd A 的高光电流效率（CE）和超过 7.5%的高光外量子效率（EQE）。此外，这些化合物产生的电致发光（EL）光谱显示出具有窄半最大值全宽（fwhm）值为 37-40nm 的峰，表明具有高的颜色纯度。此外，一种化合物 N1,N6-双（5-（叔丁基）-2-甲基苯基）-N1,N6-双（2,4-二甲基苯基）芘-1,6-二胺（3Me-1Bu-TPPDA），表现出非常高的 EQE（9.25%）和非常长的寿命，LT95 为 471h。
