Hostname: page-component-8448b6f56d-gtxcr Total loading time: 0 Render date: 2024-04-19T20:39:12.376Z Has data issue: false hasContentIssue false

Pb2+ and Ce3+ Doped SrZnO2: New Blue Luminescent Phosphors

Published online by Cambridge University Press:  01 February 2011

Alp Manavbasi
Affiliation:
manavbas@unr.nevada.edu, University of Nevada Reno, Materials Engineering, 1664 N Virginia St, Reno, NV, 89557, United States
Jeffrey C LaCombe
Affiliation:
lacomj@unr.edu, University of Nevada Reno, Materials Engineering, Reno, NV, 89557, United States
Get access

Abstract

Two new blue emitting phosphors, SrZnO2:Pb2+ and Ce3+ were synthesized by adipic acid and sucrose templated sol-gel routes, respectively. The resulting phosphor particles were fine, nanocrystalline and pure. The optimum activator concentrations were found to be 1 mol% Pb2+ and 12 mol% Ce3+. Two excitation bands centered at 283 and 317 nm, plus a weak shoulder at 275 nm were observed for Pb2+ doped samples, however only one broad excitation band with a maximum at 294 nm was observed for Ce3+ doped samples fired at 1000 °C for 2h. The emission spectra of SrZnO2:Pb2+ showed a very broad band extending from 374 to 615 nm with a maximum at ~455 nm which was ascribed to the 3P1 ¡æ 1S0 transition on the Pb2+ ions allowed by the strong spin-orbit (SO) coupling. Similarly, SrZnO2:Ce3+ showed a broad emission band extending from 374 to 609 nm and centered at 467 nm. This broad emission was attributed to the 5d1 ¡æ 4f1 transition of Ce3+ ions. The lower level 2F5/2 of the 4f1 is populated but the level 2F7/2 is almost empty at room temperature where all measurements were taken. The luminescence properties of Ce3+, K+ co-doped SrZnO2 revealed that the characteristic band locations remained the same and the ratio of emission to excitation intensities were constant. X-ray diffraction patterns showed that the SrZnO2 phase started to form at 900 °C (after 2 hrs), and the single-phase SrZnO2 obtained at 1000 °C. SEM micrographs of both phosphors have a rounded and filled morphology for individual particles with an approximate diameter of 50-250 nm. Dynamic light scattering studies revealed that average particle size is around 1 ¥ìm for both phosphors.

Type
Research Article
Copyright
Copyright © Materials Research Society 2006

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

1 Serra, O.A., Severino, V.P., Calefi, P.S., Cicillini, S.A., Alloys Compd. 323–324 (2001) p. 667.Google Scholar
2 Ekambaram, S., Patil, K.C., Maaza, M., J. Alloys Compd. 393 (2005) p. 81.Google Scholar
3 Pan, Y., Su, Q., Xu, H., Chen, T., Ge, W., Yang, C., Wu, M., J of Sol. St. Chem., 174 (2003) p.69.Google Scholar
4 Rao, R.P., Journal of Luminescence, 113 (2005) pp. 271278.Google Scholar
5 Kubota, S., Oyama, T., Yamane, H., and Shimada, M., Chem. of Mater. 15 [18] (2003) p. 3403.Google Scholar
6 Yu, X., Xu, X., Zhou, P., Peng, X., and Yang, S., Materials Letters 59 (2005) pp. 11781182.Google Scholar
7 Rani, G.N., Ayachit, N.H., Nath, K.R., and Rao, V.J., Sp. Acta Part A 60 (2004) p. 2481.Google Scholar
8 Thirunakaran, R., Kim, K.T., Kang, Y.M., Seo, C.Y., Lee, J.Y., J. Pow. Sou., 137 (2004) p.100.Google Scholar
9 Bose, S., Wu, Y., J. Am. Ceram. Soc., 88 [7] (2005) p. 1999.Google Scholar
10 Schnering, V.H.G., and Hoppe, R., Anorg. Allg. Chem. Einzeldarst, 141 (1960) pp.8798.Google Scholar
11 Folkerts, H.F., Ghianni, F., Blasse, G., J. Phys. Chem. Sol., 57 [11] (1996) p. 1659.Google Scholar
12 Shannon, R.D., Acta Cryst., A32 (1976) p. 751.Google Scholar
13 Dexter, D.L., Schulman, J.H., The J. Chem. Phys., 22 [6[, (1954) p. 1063.Google Scholar
14 Xia, G., Zhou, S., Zhang, J., Xu, J., J. Cryst. Growth. 279 (2005) p. 357.Google Scholar
15 Li, Y.Q., With, G.D., Hintzen, H.T., J. Lumin., 116 (2006) p. 107.Google Scholar
16 Warren, W.L., Vanheusden, K., Rodriguez, M.A., Seager, C.H., Tallant, D.R., Rack, P.D., Holloway, P.H., Wagner, B.K., Summers, C.J., Yocom, P.N., Appl. Phys. Lett. 70(4) (1997) p.478.Google Scholar