Hostname: page-component-78c5997874-8bhkd Total loading time: 0 Render date: 2024-11-13T02:24:14.778Z Has data issue: false hasContentIssue false
  • English
  • Français

Phosphorescent Organic Light-emitting Devices to Sense Contact Stresses

Published online by Cambridge University Press:  08 July 2011

X. A. Cao  and
Y. Q. Zhang
X. A. Cao
Affiliation:
Department of Computer Science and Electrical Engineering, West Virginia University, Morgantown, WV 26506, USA
Y. Q. Zhang
Affiliation:
Department of Computer Science and Electrical Engineering, West Virginia University, Morgantown, WV 26506, USA
Get access

Abstract

We studied the electrical and optical responses of organic light-emitting devices (OLEDs) with green and red phosphorescent dyes doped in a polymer matrix to compressive stresses. The green OLED converted stresses as low as 6.8 kPa into measurable and reversible changes in both current density and electroluminescence (EL) intensity. The current showed a nearly linear characteristic response with sensitivity up to 205 μA kPa-1, whereas the EL intensity decreased by over three orders of magnitude at 107 kPa. In contrast, stress-induced modulations in current and light intensity were noticeable in the red OLED only above 160 kPa. The discrepancy has been attributed to different rates of stress-enhanced back exciton energy transfer between guest and host molecules, which quenches the EL of the green OLED, but has a much smaller impact on the performance of the red OLED. It is expected that similar green phosphorescent OLEDs built on large curved surfaces may directly image stress distributions and sense touch on a par with a human finger.

Keywords

optoelectronicorganicpiezoresponse
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1358: Symposium MM – Organic Bioelectronics and Photonics for Sensing and Regulation , 2011 , mrss11-1358-mm06-04
Copyright
Copyright © Materials Research Society 2011

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Maheshwari, V. and Saraf, R., Angew. Chem. Int. Ed. 47, 7808 (2008).10.1002/anie.200703693Google Scholar
2. Mascaro, S. A. and Asada, H. H., IEEE Trans. Rob. Autom. 17, 698 (2001).10.1109/70.964669Google Scholar
3. Lacour, S. P., Tsay, C., and Wagner, S., IEEE Electron. Dev. Lett. 25, 792(2004).10.1109/LED.2004.839227Google Scholar
4. Rossi, D. D., Carpi, F., and Scilingo, E. P., Adv. Colloid Interface Sci. 116, 165 (2005).10.1016/j.cis.2005.05.002Google Scholar
5. Zhong, G. Y., Zhang, Y. Q., and Cao, X. A., IEEE Electron. Dev. Lett. 30, 1137 (2009).10.1109/LED.2009.2031255Google Scholar
6. Engel, J., Chen, J. and Liu, C., J. Micromech. Microeng. 13, 359 (2003).10.1088/0960-1317/13/3/302Google Scholar
7. Chandrasekhar, M., Guha, S., and Graupner, W., Adv. Mater. 13, 613 (2001).10.1002/1521-4095(200104)13:8<613::AID-ADMA613>3.0.CO;2-J3.0.CO;2-J>Google Scholar
8. Drickamer, H. G., and Frank, C. W., Annu. Rev. Phys. Chem. 23, 39 (1972).10.1146/annurev.pc.23.100172.000351Google Scholar
9. Zhong, G.Y., Liu, Y., Song, J., Zhao, Q., Li, Y., Li, F., J. Phys. D: Appl. Phys. 41, 205106 (2008).10.1088/0022-3727/41/20/205106Google Scholar
10. Cao, X. A., Jiang, Z. Y. and Zhang, Y. Q., Org. Electron. 12, 306 (2011).10.1016/j.orgel.2010.11.019Google Scholar
11. Li, Z. and Meng, H. (Ed.), Organic light-emitting materials and devices, Taylor & Francis, 2007, Ch.3.Google Scholar
12. Baldo, M. A., Lamansky, S., Burrows, P. E., Thompson, M. E., and Forrest, S. R., Appl. Phys. Lett. 75, 4 (1999).10.1063/1.124258Google Scholar
13. Reineke, S., Schwartz, G., Walzer, K., Falke, M., and Leo, K., Appl. Phys. Lett. 94, 163305 (2009).10.1063/1.3123815Google Scholar
14. Zhang, Y. Q., Zhong, G. Y., and Cao, X. A., J. Appl. Phys. 108, 083107 (2010).10.1063/1.3504599Google Scholar
15. Cao, J. X., Gong, X.G., and Wu, R.Q., Phys. Rev. B 75, 233302 (2007).10.1103/PhysRevB.75.233302Google Scholar
16. Klopffer, W., in Electronic properties of polymers , Mort, J. and Pfister, G. (Ed.), Wiley, New York, 1982, Ch.5.Google Scholar
17. Goushi, K., Kwong, R., Brown, J. J., Sasabel, H., and Adachi, C., J. Appl. Phys. 95, 7798 (2004).10.1063/1.1751232Google Scholar
18. Maheshwari, V. and Saraf, R. F., Science 312, 1501 (2006).10.1126/science.1126216Google Scholar