Eu and Dy co-activated SrB 2 Si 2 O 8 Blue Emitting Phosphor: Synthesis and Luminescence Characteristics (Fosfor SrB 2 Si 2 O 8 didopkan dengan Eu dan Dy yang Memancarkan Cahaya Biru: Sintesis dan Ciri-ciri Luminesen)

The main focus in this research was to understand the influence of Dy 3+ and Eu 3+ doping/co-doping and sintering atmosphere on the luminescence properties of SrB 2 Si 2 O 8 . Single phase Eu and Dy doped/co-doped SrB 2 Si 2 O 8 ceramics were synthesized in different atmosphere through solid state reaction technique. An inexpensive method was occupied to provide reducing sintering atmosphere. Europium doped SrB 2 Si 2 O 8 exhibit unusual reduction from trivalent to a divalent oxidation state even in an oxidizing atmosphere. We also discovered co-doping with Dy 3+ ions produced further europium reduction in this phosphor. By manipulating the sintering condition and co-doping, a reddish-purple to blue tune-able phosphor under 390 nm excitations were produced and their Commission International del’Eclairage (CIE) color coordination were calculated and plotted in a CIE 1931 diagram. Photoluminescence spectra of the Eu 2+ /Eu 3+ and Dy 3+ co-doped SrB 2 Si 2 O 8 phosphor showed energy transfer from Dy 3+ to Eu 3+ and Eu 2+ which was observable in Dy 3+ f-f excitation transitions and the Dy-O charge transfer bands. A weak 777 nm emission from 3p 5 P to 3s 5 S 0 transition of O 2- ions were observed in all the samples. The excitation and emission peaks of f - f transition from Dy 3+ and Eu 3+ as well as 4f - 5d transition of Eu 2+ were also discussed. The long excitation band in ultraviolet (UV) region from these doped/ co-doped SrB 2 Si 2 O 8 ceramics produced phosphors with efficient UV excitation for solid state lighting.