title: Synthesis and photoluminescence of EuIIin barium zinc orthosilicate: a novel green color emitting phosphor for white-LEDs.
abstract: A series of Eu2+-activated barium orthosilicates (BaZnSiO4) were synthesized using a high-temperature solid-state reaction. A photoluminescence excitation study of Eu2+shows a broad absorption band in the range of 270-450 nm, with multiple absorption peak maxima (310, 350 and 400 nm) due to 4f-5d electronic transition. The emission spectra of all the compositions show green color emission (in the spectral region 450-550 nm with a peak maximum at 502 nm and a shoulder at ~ 490 nm) with appropriate Comission Internationale de l'Eclairage (CIE) color coordinates. The two emission peaks are due to the presence of Eu2+in two different Ba sites in the BaZnSiO4host lattice. The energy transfers between the Eu2+ions in BaZnSiO4host are elucidated from the critical concentration quenching data based on the electronic multipolar interaction. All Eu2+-activated BaZnSiO4phosphor materials can be efficiently excited in the ultraviolet (UV) to near UV-region (270-420 nm), making them attractive candidate as a green phosphor for solid state lighting-white light-emitting diodes.
authors.affiliation: Department of Chemistry, National Institute of Technology Rourkela, Odisha, India.
authors.forename: S
authors.initials: S
authors.lastname: Kasturi
authors.affiliation: Department of Chemistry, National Institute of Technology Rourkela, Odisha, India.
authors.forename: V
authors.initials: V
authors.lastname: Sivakumar
authors.affiliation: Department of Chemistry, Indian Institute of Technology Madras, Chennai, Tamil Nadu, India.
authors.forename: U V
authors.initials: UV
authors.lastname: Varadaraju
mesh_terms: D001464:Barium / Q000737:chemistry*; D003116:Color; D049449:Luminescence; D049408:Luminescent Agents / Q000138:chemical synthesis* / Q000737:chemistry*; D055668:Photochemical Processes; D017640:Silicates / Q000737:chemistry*; D012984:Software; D015032:Zinc / Q000737:chemistry*
chemical_list: D049408:Luminescent Agents; D017640:Silicates; D001464:Barium; D015032:Zinc
keywords: green phosphor; orthosilicate; solid-state lighting; white-LEDs