Multichannel Luminescence Properties of Mixed-Valent Eu2+ /Eu3+ Coactivated SrAl3 BO7 Nanocrystalline Phosphors for Near-UV LEDs

Inorganic Chemistry
Xiaoming LiuLiushui Yan

Abstract

Up to now, orchestrating the coexistence of Eu2+ and Eu3+ activators in a single host lattice has been an extremely difficult task, especially for the appearance of the characteristic emission of Eu2+ and Eu3+ in order to generate white light. Nevertheless, here we demonstrate a new Eu2+/Eu3+ coactivated SrAl3BO7 nanocrystalline phosphor with abundant and excellent multichannel luminescence properties. A series of Eu2+/Eu3+ coactivated SrAl3BO7 nanocrystalline phosphors were prepared through a Pechini-type sol-gel method followed by a reduction process. With excitation of UV/NUV light, the prepared SrAl3BO7:Eu2+,Eu3+ phosphors show not only the characteristic f-f transitions of Eu3+ ion (5DJ → 7FJ,J', J, J' = 0-3), but also the 5d → 4f transitions of Eu2+ ion with comparable intensity from 400 to 700 nm in the whole visible spectral region. The luminescence color of the SrAl3BO7:Eu2+,Eu3+ phosphor can be tuned from blue, blue-green, white, and orange to orange-red by changing the excitation wavelength, the overall doping concentration of europium ions (Eu2+, Eu3+), and the relative ratio of Eu2+ to Eu3+ ions to some extent. A single-phase white-light emission has been realized in SrAl3BO7:Eu2+,Eu3+ phosphor. The obtained SrAl3B...Continue Reading

References

Mar 13, 2010·Journal of the American Chemical Society·Sangmoon Park, Thomas Vogt
Dec 19, 2013·Chemical Society Reviews·Mengmeng ShangJun Lin
Jun 2, 2011·The Journal of Physical Chemistry Letters·Chun Che Lin, Ru-Shi Liu
Dec 4, 1998·Angewandte Chemie·Thomas JüstelCees Ronda

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