Abstract：
:The effect of n-type interlayer in hybrid white organic light-emitting diodes (WOLEDs) has been systematically investigated by using various n-type materials. A new finding, that the triplet energy rather than electron mobility or hole-blocking ability of interlayer plays a more positive role in the performance of hybrid WOLEDs, is demonstrated. Based on the new finding, a more efficient n-type interlayer bis[2-(2-hydroxyphenyl)-pyridine] beryllium has been employed to realize a high-performance hybrid WOLED. The resulting device (without n-doping technology) exhibits low voltages (i.e., 2.8 V for 1 cd/m(2), 3.9 V for 100 cd/m(2)) and low efficiency roll-off (i.e., 11.5 cd/A at 100 cd/m(2) and 11.2 cd/A at 1000 cd/m(2)). At the display-relevant luminance of 100 cd/m(2), a total power efficiency of 16.0 lm/W, a color rendering index of 73 and an extremely long lifetime of 12596265 h are obtained. Such superior results not only comprehensively indicate that the n-type materials are effective interlayers to develop high-performance hybrid WOLEDs but also demonstrate a significant step towards real commercialization in WOLEDs.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Liu B,Wang L,Xu M,Tao H,Zou J,Gao D,Lan L,Ning H,Peng J,Cao Ydoi
10.1038/srep07198subject
Has Abstractpub_date
2014-11-26 00:00:00pages
7198issn
2045-2322pii
srep07198journal_volume
4pub_type
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