Abstract

Highly efficient electrophosphorescent organic light-emitting diodes (PHOLEDs) containing mixed hosts of bis(3,5-di(9H-carbazol-9-yl)phenyl)diphenylsilane (SimCP2) and 1,3-bis[(4-tert-butylphenyl)-1,3,4-oxadiazolyl]phenylene (OXD-7) and a soluble derivative of the green emitter fac-tris(2-phenylpyridine)iridium (III) [(Ir(ppy)<sub>3</sub>] have been demonstrated. All organic layers were mixed in a single layer for solution processing during the fabrication of the PHOLEDs. The amorphous mixed host of SimCP2:OXD-7:Ir(ppy)<sub>3</sub> exhibited ambipolar charge transport as well as high hole and electron mobilities on the order of 10<sup>-7</sup> cm<sup>2</sup>/Vs from space-charge-limited current measurement. The values of both the hole and electron mobilities were 100 times greater than that of the widely used poly(9-vinylcarbazole) (PVK):OXD-7:Ir(ppy)<sub>3</sub> host, resulting in efficient charge balance in the SimCP2 host. Based on a simple fabrication process of single-layer PHOLED, a green device with the maximum luminous and power efficiencies of 42 cd/A and 20 lm/W, respectively, was obtained at 600 cd/m<sup>2</sup>.

© 2011 IEEE

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2011 (1)

S.-W. Liu, C.-H. Yuan, S.-J. Yen, M.-F. Wu, C.-T. Chen, C.-C. Lee, "Efficiency enhancement of solution-processed single-layer blue-phosphorescence organic light-emitting devices having co-host materials of polymer (PVK) and small-molecule (SimCP2)," J. Soc. Inf. Display 19/4, 330-336 (2011).

2010 (2)

J.-H. Jou, W.-B. Wang, S.-Z. Chen, J.-J. Shyue, M.-F. Hsu, C.-W. Lin, S.-M. Shen, C.-J. Wang, C.-P. Liu, C.-T. Chen, M.-F. Wu, S.-W. Liu, "High-efficiency blue organic light-emitting diodes using a 3,5-di(9H-carbazol-9-yl)tetraphenylsilane host via a solution-process," J. Mater. Chem. 20, 8411-8416 (2010).

N. C. Erickson, R. J. Holmes, "Highly efficient, single-layer organic light-emitting devices based on a graded-composition emissive layer," Appl. Phys. Lett. 97, (2010) Art. ID 083308.

2009 (1)

T. Tsuboi, S.-W. Liu, M.-F. Wu, C.-T. Chen, "Spectroscopic and electrical characteristics of highly efficient tetraphenylsilane-carbazole organic compound as host material for blue organic light emitting diodes," Org. Electron. 10, 1372-1377 (2009).

2007 (4)

Y. Ohmori, H. Kajii, Y. Hino, "Organic light-emitting diodes fabricated by a solution process and their stress tolerance," J. Disp. Technol. 3, 238-244 (2007).

S. Reineke, G. Schwartz, K. Walzer, K. Leo, "Reduced efficiency roll-off in phosphorescent organic light emitting diodes by suppression of triplet-triplet annihilation," Appl. Phys. Lett. 91, 123-508 (2007).

M.-F. Wu, S.-J. Yeh, C.-T. Chen, H. Murayama, T. Tsuboi, W.-S. Li, I. Chao, S.-W. Liu, J.-K. Wang, "The quest for high-performance host materials for electrophosphorescent blue dopants," Adv. Funct. Mater. 17, 1887-1895 (2007).

J. Meyer, S. Hamwi, T. Bulow, H. H. Johannes, T. Riedl, W. Kowalsky, "Highly efficient simplified organic light emitting diodes," Appl. Phys. Lett. 91, 113-506 (2007).

2006 (2)

S. A. Choulis, M. K. Mathai, V.-E. Choong, F. So, "Highly efficient organic electroluminescent device with modified cathode," Appl. Phys. Lett. 88, 203-502 (2006).

X. H. Yang, D. C. Muller, D. Neher, K. Meerholz, "Highly efficient polymeric electrophosphorescent diodes," Adv. Mater. 18, 948-954 (2006).

2005 (2)

S.-J. Yeh, M.-F. Wu, C.-T. Chen, Y.-H. Song, Y. Chi, M.-H. Ho, S.-F. Hsu, C. H. Chen, "New dopant and host materials for blue-light-emitting phosphorescent organic electroluminescent devices," Adv. Mater. 17, 285-289 (2005).

S. A. Choulis, V.-E. Choong, M. K. Mathai, F. So, "The effect of interfacial layer on the performance of organic light-emitting diodes," Appl. Phys. Lett. 87, 113-503 (2005).

2004 (1)

A. Nakamura, T. Tada, M. Mizukami, S. Yagyu, "Efficient electrophosphorescent polymer light-emitting devices using a Cs/Al cathode," Appl. Phys. Lett. 84, 130-132 (2004).

2002 (1)

X. Gong, M. R. Robinson, J. C. Ostrowski, D. Moses, G. C. Bazan, A. J. Heeger, "High-efficiency polymer-based electrophosphorescent devices," Adv. Mater. 14, 581-585 (2002).

2000 (1)

D. A. Pardo, G. E. Jabbour, N. Peyghambarian, "Application of screen printing in the fabrication of organic light-emitting devices," Adv. Mater. 12, 1249-1252 (2000).

1998 (1)

J. Bharathan, Y. Yang, "Polymer electroluminescent devices processed by inkjet printing: I. Polymer light-emitting logo," Appl. Phys. Lett. 72, 2660-2662 (1998).

1994 (1)

J. Kido, K. Hongawa, K. Okuyama, K. Nagai, "White light-emitting organic electroluminescent devices using the poly(N-vinylcarbazole) emitter layer doped with three fluorescent dyes," Appl. Phys. Lett. 64, 815-817 (1994).

1990 (1)

J. H. Burroughes, D. D. C. Bradley, A. R. Brown, R. N. Marks, K. Mackay, R. H. Friend, P. L. Burns, A. B. Holmes, "Light-emitting-diodes based on conjugated polymers," Nature 347, 539-541 (1990).

1972 (1)

W. D. Gill, "Drift mobilities in amorphous charge-transfer complexes of trinitrofluorenone and poly-n-vinylcarbazole," J. Appl. Phys. 43, 5033-5040 (1972).

Adv. Funct. Mater. (1)

M.-F. Wu, S.-J. Yeh, C.-T. Chen, H. Murayama, T. Tsuboi, W.-S. Li, I. Chao, S.-W. Liu, J.-K. Wang, "The quest for high-performance host materials for electrophosphorescent blue dopants," Adv. Funct. Mater. 17, 1887-1895 (2007).

Adv. Mater. (4)

D. A. Pardo, G. E. Jabbour, N. Peyghambarian, "Application of screen printing in the fabrication of organic light-emitting devices," Adv. Mater. 12, 1249-1252 (2000).

X. Gong, M. R. Robinson, J. C. Ostrowski, D. Moses, G. C. Bazan, A. J. Heeger, "High-efficiency polymer-based electrophosphorescent devices," Adv. Mater. 14, 581-585 (2002).

X. H. Yang, D. C. Muller, D. Neher, K. Meerholz, "Highly efficient polymeric electrophosphorescent diodes," Adv. Mater. 18, 948-954 (2006).

S.-J. Yeh, M.-F. Wu, C.-T. Chen, Y.-H. Song, Y. Chi, M.-H. Ho, S.-F. Hsu, C. H. Chen, "New dopant and host materials for blue-light-emitting phosphorescent organic electroluminescent devices," Adv. Mater. 17, 285-289 (2005).

Appl. Phys. Lett. (8)

S. Reineke, G. Schwartz, K. Walzer, K. Leo, "Reduced efficiency roll-off in phosphorescent organic light emitting diodes by suppression of triplet-triplet annihilation," Appl. Phys. Lett. 91, 123-508 (2007).

N. C. Erickson, R. J. Holmes, "Highly efficient, single-layer organic light-emitting devices based on a graded-composition emissive layer," Appl. Phys. Lett. 97, (2010) Art. ID 083308.

A. Nakamura, T. Tada, M. Mizukami, S. Yagyu, "Efficient electrophosphorescent polymer light-emitting devices using a Cs/Al cathode," Appl. Phys. Lett. 84, 130-132 (2004).

J. Kido, K. Hongawa, K. Okuyama, K. Nagai, "White light-emitting organic electroluminescent devices using the poly(N-vinylcarbazole) emitter layer doped with three fluorescent dyes," Appl. Phys. Lett. 64, 815-817 (1994).

J. Bharathan, Y. Yang, "Polymer electroluminescent devices processed by inkjet printing: I. Polymer light-emitting logo," Appl. Phys. Lett. 72, 2660-2662 (1998).

S. A. Choulis, M. K. Mathai, V.-E. Choong, F. So, "Highly efficient organic electroluminescent device with modified cathode," Appl. Phys. Lett. 88, 203-502 (2006).

S. A. Choulis, V.-E. Choong, M. K. Mathai, F. So, "The effect of interfacial layer on the performance of organic light-emitting diodes," Appl. Phys. Lett. 87, 113-503 (2005).

J. Meyer, S. Hamwi, T. Bulow, H. H. Johannes, T. Riedl, W. Kowalsky, "Highly efficient simplified organic light emitting diodes," Appl. Phys. Lett. 91, 113-506 (2007).

J. Appl. Phys. (1)

W. D. Gill, "Drift mobilities in amorphous charge-transfer complexes of trinitrofluorenone and poly-n-vinylcarbazole," J. Appl. Phys. 43, 5033-5040 (1972).

J. Disp. Technol. (1)

Y. Ohmori, H. Kajii, Y. Hino, "Organic light-emitting diodes fabricated by a solution process and their stress tolerance," J. Disp. Technol. 3, 238-244 (2007).

J. Mater. Chem. (1)

J.-H. Jou, W.-B. Wang, S.-Z. Chen, J.-J. Shyue, M.-F. Hsu, C.-W. Lin, S.-M. Shen, C.-J. Wang, C.-P. Liu, C.-T. Chen, M.-F. Wu, S.-W. Liu, "High-efficiency blue organic light-emitting diodes using a 3,5-di(9H-carbazol-9-yl)tetraphenylsilane host via a solution-process," J. Mater. Chem. 20, 8411-8416 (2010).

J. Soc. Inf. Display (1)

S.-W. Liu, C.-H. Yuan, S.-J. Yen, M.-F. Wu, C.-T. Chen, C.-C. Lee, "Efficiency enhancement of solution-processed single-layer blue-phosphorescence organic light-emitting devices having co-host materials of polymer (PVK) and small-molecule (SimCP2)," J. Soc. Inf. Display 19/4, 330-336 (2011).

Nature (1)

J. H. Burroughes, D. D. C. Bradley, A. R. Brown, R. N. Marks, K. Mackay, R. H. Friend, P. L. Burns, A. B. Holmes, "Light-emitting-diodes based on conjugated polymers," Nature 347, 539-541 (1990).

Org. Electron. (1)

T. Tsuboi, S.-W. Liu, M.-F. Wu, C.-T. Chen, "Spectroscopic and electrical characteristics of highly efficient tetraphenylsilane-carbazole organic compound as host material for blue organic light emitting diodes," Org. Electron. 10, 1372-1377 (2009).

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