title: Synthesis and effect of Ce and Mn co-doping on photoluminescence characteristics of Ca6AlP5O20:Eu novel phosphors.
abstract: A series of Ca6AlP5O20 doped with rare earths (Eu and Ce) and co-doped (Eu, Ce and Eu,Mn) were prepared by combustion synthesis. Under Hg-free excitation, Ca6AlP5O20:Eu exhibited Eu(2+) (486 nm) emission in the blue region of the spectrum and under near Hg excitation (245 nm), Ca6AlP5O20:Ce phosphor exhibited Ce(3+) emission (357 nm) in the UV range. Photoluminescence (PL) peak intensity increased in Ca6AlP5O20:Eu,Ce and Ca6AlP5O20: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. Ca6AlP5O20:Eu, Ce and Ca6AlP5O20: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 Ca6AlP5O20:Eu, Ce and Eu ions acted as activators and Mn ions acted as sensitizers in Ca6AlP5O20: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.
authors.affiliation: NS Science and Arts College, Bhadrawati, Chandrapur, India. kartik_shinde@rediffmail.com
authors.forename: K N
authors.initials: KN
authors.lastname: Shinde
authors.forename: S J
authors.initials: SJ
authors.lastname: Dhoble
mesh_terms: D002563:Cerium / Q000737:chemistry*; D004735:Energy Transfer; D005063:Europium / Q000737:chemistry*; D049408:Luminescent Agents / Q000138:chemical synthesis / Q000737:chemistry*; D008163:Luminescent Measurements / Q000295:instrumentation; D008345:Manganese / Q000737:chemistry*; D010758:Phosphorus / Q000737:chemistry*
chemical_list: D049408:Luminescent Agents; D010758:Phosphorus; D002563:Cerium; D008345:Manganese; D005063:Europium