| Title | Highly Simplified Reddish Orange Phosphorescent Organic Light-Emitting Diodes Incorporating a Novel Carrier- and Exciton-Confining Spiro-Exciplex-Forming Host for Reduced Efficiency Roll-off |
| Authors | Xu, Ting Zhang, Ye-Xin Wang, Bo Huang, Chen-Chao Murtaza, Imran Meng, Hong Liao, Liang-Sheng |
| Affiliation | Peking Univ, Shenzhen Grad Sch, Sch Adv Mat, Shenzhen 518055, Peoples R China. Soochow Univ, Inst Funct Nano & Soft Mat FUNSOM, Jiangsu Key Lab Carbon Based Funct Mat & Devices, Suzhou 215123, Jiangsu, Peoples R China. Nanjing Tech Univ, Jiangsu Natl Synergist Innovat Ctr Adv Mat, Key Lab Flexible Elect, Nanjing 211816, Jiangsu, Peoples R China. Nanjing Tech Univ, Jiangsu Natl Synergist Innovat Ctr Adv Mat, Inst Adv Mat, Nanjing 211816, Jiangsu, Peoples R China. Int Islamic Univ, Dept Phys, Islamabad 44000, Pakistan. Peking Univ, Shenzhen Grad Sch, Sch Adv Mat, Shenzhen 518055, Peoples R China. Liao, LS (reprint author), Soochow Univ, Inst Funct Nano & Soft Mat FUNSOM, Jiangsu Key Lab Carbon Based Funct Mat & Devices, Suzhou 215123, Jiangsu, Peoples R China. |
| Keywords | OLED reddish orange phosphorescence exciplex-forming host hole-transport-material-free efficiency roll-off ACTIVATED DELAYED FLUORESCENCE ELECTRON-TRANSPORT MATERIALS EXTERNAL QUANTUM EFFICIENCY PEROVSKITE SOLAR-CELLS HIGH-POWER-EFFICIENCY ELECTROLUMINESCENT DEVICES ELECTROPHOSPHORESCENT DEVICES IRIDIUM COMPLEXES OPERATING VOLTAGE BIPOLAR TRANSPORT |
| Issue Date | 2017 |
| Publisher | ACS APPLIED MATERIALS & INTERFACES |
| Citation | ACS APPLIED MATERIALS & INTERFACES.2017,9(3),2701-2710. |
| Abstract | 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. |
| URI | http://hdl.handle.net/20.500.11897/475598 |
| ISSN | 1944-8244 |
| DOI | 10.1021/acsami.6b13077 |
| Indexed | SCI(E) |
| Appears in Collections: | 新材料学院 |
