New yellowish-green light emitting thin film: 89Al2O 3s5CeCl3s3EuCl3s3TbCl3

W. González, E. Álvarez, G. C. Righini, U. Caldiño*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Aluminum oxide films doped with CeCl3, EuCl3, CeCl3/EuCl3 and CeCl3/EuCl3/ TbCl3 were deposited by ultrasonic spray pyrolysis. The films were analyzed by X-ray diffraction (XRD). The XRD results revealed that the films are predominantly amorphous independent of dopants. The optical spectroscopy of these films was performed through photoluminescence spectra and decay times. Non-radiative energy transfers from Ce3+ to Tb3+ and from Ce3+ to Eu3+ take place when the films are excited at 280 nm. Excitation at 280 nm fits to the requirements of AlGaN-based LEDs. In the 89Al2Ȯ5CeCl3ṡ3EuCl 3ṡ3TbCl3 film the simultaneous emission of the activators (Tb3+ and Eu3+) and sensitizer (Ce 3+) leads to yellowish-green light emission with CIE1931 chromaticity coordinates, x = 0.32 and y = 0.52. This type of thin films might contribute to the development of AlGaN-based LEDs pumped phosphors for solid-state yellowish-green lighting.

Original languageEnglish
Pages (from-to)1304-1308
Number of pages5
JournalOptical Materials
Volume35
Issue number6
DOIs
StatePublished - Apr 2013
Externally publishedYes

Bibliographical note

Funding Information:
This work was supported by CONACyT-CNR bilateral agreement under project contract 173855.

Keywords

  • Photoluminescence
  • Thin film

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