期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 3, 页码 2701-2710出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b13077
关键词
OLED; reddish orange phosphorescence; exciplex-forming host; hole-transport-material-free; efficiency roll-off
资金
- National Natural Science Foundation of China [61575136, 51035008, 51373075]
- National Basic Research Program of China (973 Program) [2015CB932200]
- Collaborative Innovation Center of Suzhou Nano Science and Technology
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Shenzhen Key Laboratory of Organic Optoelectromagnetic Functional Materials of Shenzhen Science and Technology Plan [ZDSYS20140509094114164]
- Shenzhen Science and Technology Research Grant [JCYJ20160510144254604]
- Guangdong Key Research Project [2014B090914003]
- Shenzhen Peacock Plan [KQTD2014062714543296]
- Guangdong Academician Work-station [2013B090400016]
A novel exciplex-forming host is applied so as to design highly simplified reddish orange light-emitting diodes (OLEDs) with low driving voltage, high efficiency, and an extraordinarily low efficiency roll-off, by combining N,N-10-triphenyl-10H-spiro [acridine-9,9'-fluoren]-3'-amine (SAFDPA) with 4,7-diphenyl-1,10-phenanthroline (Bphen) doped with trivalent iridium complex bis(2-methyldibenzo[f,h]quinoxaline) (acetylacetonate)iridium(III) (Ir(MDQ)(2)(acac)). The reddish orange OLEDs achieve a strikingly high power efficiency (PE) of 31.80 lm/W with an ultralow threshold voltage of 2.24 V which is almost equal to the triplet energy level of the phosphorescent reddish orange emitting dopant. The power efficiency of the device with the exciplex-forming host is enhanced, achieving 36.2% mainly owing to the lower operating voltage by the novel exciplex forming cohost, compared with the reference device (23.54 lm/W). Moreover, the OLEDs show extraordinarily low current efficiency (CE) roll-off to 1.41% at the brightness from 500 to 5000 cd/m(2) with a maximal CE of 32.87 cd/A (EQE(max) = 11.01%). The devices display a good reddish orange color (CIE of (0.628, 0.372) at 500 cd/m2) nearly without color shift with increasing brightness. Co-host architecture phosphorescent OLEDs show a simpler device structure, lower working voltage, and a better efficiency and stability than those of the reference devices without the cohost architecture, which helps to simplify the OLED structure, lower the cost, and popularize OLED technology.
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