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Synthesis and effect of Ce and Mn co‐doping on photoluminescence characteristics of Ca 6 AlP 5 O 20 :Eu novel phosphors
Author(s) -
Shinde K. N.,
Dhoble S. J.
Publication year - 2012
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.2370
Subject(s) - phosphor , photoluminescence , doping , materials science , analytical chemistry (journal) , luminescence , inorganic chemistry , chemistry , optoelectronics , environmental chemistry
A series of Ca 6 AlP 5 O 20 doped with rare earths (Eu and Ce) and co‐doped (Eu, Ce and Eu,Mn) were prepared by combustion synthesis. Under Hg‐free excitation, Ca 6 AlP 5 O 20 :Eu exhibited Eu 2+ (486 nm) emission in the blue region of the spectrum and under near Hg excitation (245 nm), Ca 6 AlP 5 O 20 :Ce phosphor exhibited Ce 3+ emission (357 nm) in the UV range. Photoluminescence (PL) peak intensity increased in Ca 6 AlP 5 O 20 :Eu,Ce and Ca 6 AlP 5 O 20 :Eu, Mn phosphors due to co‐activators of Ce 3+ and Mn 2+ ions. As a result, these ions played an important role in PL emission in the present matrix. Ca 6 AlP 5 O 20 :Eu, Ce and Ca 6 AlP 5 O 20 :Eu, Mn phosphors provided energy transfer mechanisms via Ce 3+ → Eu 2+ and Eu 2+ → Mn 2+ , respectively. Eu ions acted as activators and Ce ions acted as sensitizers. Ce emission energy was well matched with Eu excitation energy in the case of Ca 6 AlP 5 O 20 :Eu, Ce and Eu ions acted as activators and Mn ions acted as sensitizers in Ca 6 AlP 5 O 20 :Eu, Mn. This study included synthesis of new and efficient phosphate phosphors. The impact of doping and co‐doping on photoluminescence properties and energy transfer mechanisms were investigated and we propose a feasible interpretation. Copyright © 2012 John Wiley & Sons, Ltd.