Purely organic electroluminescent material realizing 100% conversion from electricity to light

Nature Communications

Volumn 6, Issue , 2015, Pages

  Kaji, Hironori ^a   Suzuki, Hajime ^a   Fukushima, Tatsuya ^a   Shizu, Katsuyuki ^a,b   Suzuki, Katsuaki ^a   Kubo, Shosei ^a   Komino, Takeshi ^b   Oiwa, Hajime ^a   Suzuki, Furitsu ^a   Wakamiya, Atsushi ^a   Murata, Yasujiro ^a   Adachi, Chihaya ^b,c  

^a KYOTO UNIVERSITY   (Japan)

^b KYUSHU UNIVERSITY   (Japan)

^c JAPAN SCIENCE AND TECHNOLOGY AGENCY   (Japan)

Author keywords

[No Author keywords available]

Indexed keywords

ELECTRICITY; IRIDIUM; LIGHT; LUMINESCENCE; ORGANIC COMPOUND; PHOTOCHEMISTRY; PLATINUM;

EID: 84945218785     PISSN: None     EISSN: 20411723     Source Type: Journal    
DOI: 10.1038/ncomms9476     Document Type: Article

References (49)

1. Bernanose, A., Comte, M., Vouaux, P. A new method of emission of light by certain organic compounds. J. Chim. Phys. 50, 64-68 (1953).
2. Bernanose, A. Electroluminescence of organic compounds. Br. J. Appl. Phys. 6, S54-S56 (1955).
3. Pope, M., Kallmann, H. P., Magnante, P. Electroluminescence in organic crystals. J. Chem. Phys. 38, 2042-2043 (1963).
4. Tang, C. W., VanSlyke, S. A. Organic electroluminescent diodes. Appl. Phys. Lett. 51, 913-915 (1987).
5. Smith, L. H., Wasey, J. A. E., Barnes, W. L. Light outcoupling efficiency of top-emitting organic light-emitting diodes. Appl. Phys. Lett. 84, 2986-2988 (2004).
6. Chutinan, A., Ishihara, K., Asano, T., Fujita, M., Noda, S. Theoretical analysis on light-extraction efficiency of organic light-emitting diodes using FDTD and mode-expansion methods. Org. Electron. 6, 3-9 (2005).
7. Tanaka, D. et al. Ultra high efficiency green organic light-emitting devices. Jpn J. Appl. Phys. 46, L10-L12 (2007).
8. Furno, M., Meerheim, R., Hofmann, S., Lüssem, B., Leo, K. Efficiency and rate of spontaneous emission in organic electroluminescent devices. Phys. Rev. B 85, 115205 (2012).
9. Baldo, M. A. et al. Highly efficient phosphorescent emission from organic electroluminescent devices. Nature 395, 151-154 (1998).
10. Adachi, C., Baldo, M. A., Thompson, M. E., Forrest, S. R. Nearly 100% internal phosphorescence efficiency in an organic light emitting device. J. Appl. Phys. 90, 5048-5051 (2001).
11. Sasabe, H., Kido, J. Recent progress in phosphorescent organic light-emitting devices. Eur. J. Org. Chem. 34, 7653-7663 (2013).
12. Jablonski, A. Efficiency of anti-stokes fluorescence in dyes. Nature 131, 839-840 (1933).
13. Jablonski, A. About the mechanism of photo-luminescence of dye phosphors. Z. Physik. 94, 38-46 (1935).
14. Lewis, G. N., Lipkin, D., Magel, T. T. Reversible photochemical processes in rigid media. A study of the phosphorescent state. J. Am. Chem. Soc. 63, 3005-3018 (1941).
15. Parker, C. A., Hatchard, C. G. Triplet-singlet emission in fluid solutions. Phosphorescence of eosin. Trans. Faraday. Soc. 57, 1894-1904 (1961).
16. Parker, C. A. in Advances Photochemistry, Vol. 2 (eds Noyes, W. A., Hammond, G. S., Pitts, J. N.) (John Wiley & Sons, Inc., Hoboken, NJ, USA, 1964).
17. Endo, A. et al. Efficient up-conversion of triplet excitons into a singlet state and its application to organic light emitting diodes. Appl. Phys. Lett. 98, 0833022 (2011).
18. Méhes, G., Nomura, H., Zhang, O., Nakagawa, T., Adachi, C. Enhanced electroluminescence efficiency in a spiro-acridine derivative through thermally activated delayed fluorescence. Angew. Chem. Int. Ed. 51, 11311-11315 (2012).
19. Uoyama, H., Goushi, K., Shizu, K., Nomura, H., Adachi, C. Highly efficient organic light-emitting diodes by delayed fluorescence. Nature 492, 234-238 (2012).
20. Dias, F. B. et al. Triplet harvesting with 100% efficiency by way of thermally activated delayed fluorescence in charge transfer OLED emitters. Adv. Mater. 25, 3707-3714 (2013).
21. Sato, K. et al. Organic luminescent molecule with energetically equivalent singlet and triplet excited states for organic light-emitting diodes. Phys. Rev. Lett. 110, 247401 (2013).
22. Hariharan, P. C., Pople, J. A. The influence of polarization functions on molecular orbital hydrogenation energies. Theor. Chim. Acta 28, 213-222 (1973).
23. Adamo, C., Barone, V. Toward reliable density functional methods without adjustable parameters: the PBE0 model. J. Chem. Phys. 110, 6158-6170 (1999).
24. Frisch, M. J. et al. Gaussian 09, Revision C. 01. http://www.gaussian.com/index.htm (2010).
25. Swallen, S. F. et al. Organic glasses with exceptional thermodynamic and kinetic stability. Science 315, 353-356 (2007).
26. Birks, J. B. Photophysics of Aromatic Molecules. 372 (Wiley-Interscience, 1970).
27. Kondakov, D. Y., Pawlik, T. D., Hatwar, T. K., Spindler, J. P. Triplet annihilation exceeding spin statistical limit in highly efficient fluorescent organic light-emitting diodes. J. Appl. Phys. 106, 124510 (2009).
28. Kohler, A., Bässler, H. Triplet states in organic semiconductors. Mater. Sci. Eng. R 66, 71-109 (2009).
29. Luo, Y., Aziz, H. Correlation between triplet-triplet annihilation and electroluminescence efficiency in doped fluorescent organic light-emitting devices. Adv. Funct. Mater. 20, 1285-1293 (2010).
30. Bauernschmitt, R., Ahlrichs, R. Treatment of electronic excitations within the adiabatic approximation of time dependent density functional theory. Chem. Phys. Lett. 256, 454-464 (1996).
31. Casida, M. E., Jamorski, C., Casida, K. C., Salahub, D. R. Molecular excitation energies to high-lying bound states from time-dependent density-functional response theory: characterization and correction of the time-dependent local density approximation ionization threshold. J. Chem. Phys. 108, 4439-4449 (1998).
32. Kim, S.-Y. et al. Organic light-emitting diodes with 30% external quantum efficiency based on a horizontally oriented emitter. Adv. Funct. Mater. 23, 3896-3900 (2013).
33. Mayr, C. et al. Efficiency enhancement of organic light-emitting diodes incorporating a highly oriented thermally activated delayed fluorescence emitter. Adv. Funct. Mater. 24, 5232-5239 (2014).
34. Schmidt, T. D., Scholz, B., Mayr, C., Brütting, W. Efficiency analysis of organic light-emitting diodes based on optical simulations. IEEE J. Sel. Top. Quantum Electron. 19, 7800412 (2013).
35. Schmidt, T. D. et al. Extracting the emitter orientation in organic light-emitting diodes from external quantum efficiency measurements. Appl. Phys. Lett. 105, 043302 (2014).
36. Woollam, J. A. et al. Overview of variable angle spectroscopic ellipsometry (VASE), part I: basic theory and typical applications. Proc. SPIE CR72, 3-28 (1999).
37. Lin, H-W. et al. Anisotropic optical properties and molecular orientation in vacuum-deposited ter(9,9-diarylfluorene)s thin films using spectroscopic ellipsometry. J. Appl. Phys. 95, 881-886 (2004).
38. Yokoyama, D., Setoguchi, Y., Sakaguchi, A., Suzuki, M., Adachi, C. Orientation control of linear-shaped molecules in vacuum-deposited organic amorphous films and its effect on carrier mobilities. Adv. Funct. Mater. 20, 386-391 (2010).
39. Frischeisen, J., Yokoyama, D., Adachi, C., Brütting, W. Determination of molecular dipole orientation in doped fluorescent organic thin films by photoluminescence measurements. Appl. Phys. Lett. 96, 073302 (2010).
40. Sun, J. W. et al. A fluorescent organic light-emitting diode with 30% external quantum efficiency. Adv. Mater. 26, 5684-5688 (2014).
41. Knapp, E., Haeusermann, R., Schwarzenbach, H. U., Ruhstaller, B. Numerical simulation of charge transport in disordered organic semiconductor devices. J. Appl. Phys. 108, 054504 (2010).
42. Ruhstaller, B. et al. Simulating electronic and optical processes in multilayer organic light-emitting devices. IEEE J. Sel. Top. Quantum Electron. 9, 723-731 (2003).
43. Perucco, B. et al. On the exciton profile in OLEDs-seamless optical and electrical modeling. Org. Electron. 13, 1827-1835 (2012).
44. Jordan, R. H., Dodabalapur, A., Slusher, R. E. Efficiency enhancement of microcavity organic light emitting diodes. Appl. Phys. Lett. 69, 1997-1999 (1996).
45. Möller, S., Forrest, S. R. Improved light out-coupling in organic light emitting diodes employing ordered microlens arrays. J. Appl. Phys. 91, 3324-3327 (2002).
46. Sun, Y., Forrest, S. R. Enhanced light out-coupling of organic light-emitting devices using embedded low-index grids. Nat. Photon. 2, 483-487 (2008).
47. Reineke, S. et al. White organic light-emitting diodes with fluorescent tube efficiency. Nature 459, 234-238 (2009).
48. Saxena, K., Jain, V. K., Mehta, D. S. A review on the light extraction techniques in organic electroluminescent devices. Opt. Mater. 32, 221-233 (2009).
49. Sasabe, H. et al. Extremely low operating voltage green phosphorescent organic light-emitting devices. Adv. Funct. Mater. 23, 5550-5555 (2013).