4.6 Article

Sr3Al2O5Cl2:Ce3+,Eu2+: A potential tunable yellow-to-white-emitting phosphor for ultraviolet light emitting diodes

Journal

APPLIED PHYSICS LETTERS
Volume 94, Issue 9, Pages -

Publisher

AMER INST PHYSICS
DOI: 10.1063/1.3094753

Keywords

cerium; europium; light emitting diodes; phosphors; strontium compounds; ultraviolet radiation effects

Funding

  1. National Basic Research Program of China [2007CB935502]
  2. National Natural Science Foundation of China [20771098]

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The Sr3Al2O5Cl2:Ce3+,Eu2+ phosphors were prepared by solid state reaction. The obtained phosphors exhibit a strong absorption in the UV-visible region and have two intense emission bands at 444 and 609 nm. The energy transfer from the Ce3+ to Eu2+ ions was observed, and the critical distance has been estimated to be about 24.5 A by spectral overlap method. Furthermore, the developed phosphors can generate lights from yellow-to-white region under the excitation of UV radiation by appropriately tuning the activator content, indicating that they have potential applications as an UV-convertible phosphor for white light emitting diodes.

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