Color-Tunable and Highly Luminous N3–-Doped Ba2–xCaxSiO4−δN2/3δ:Eu2+ (0.0 ≤ x ≤ 1.0) Phosphors for White NUV-LED

• DOI: 10.1021/acsami.6b02778
• Publication Date: 2016-06-20T15:42:37Z
• Authors: Donghyeon Kim; Jong-Seong Bae; Tae Eun Hong; Kwun Nam Hui; Sungyun Kim; Chang Hae Kim; Jung-Chul Park
• Keywords: Orthorhombic crystal system; Chromaticity

In the search for well-defined phosphor materials white NUV-LEDs, highly enhanced luminous efficacy by N(3-) doping as well color tunability via Ca substitution has been successfully obtained in Ba2-xCaxSiO4-δN2/3δ:Eu(2+) (x = 0.0, 0.5, 0.8, 1.0) phosphors. With increasing Ca-substitution rate, crystal structures of are changed from primitive orthorhombic structure to hexagonal one, so that CIE coordinates move bluish-green (at 0.0), blue 0.5), and finally near region 0.8 these materials. combination with results X-ray photoelectron spectroscopy (XPS) infrared (IR) spectroscopy, elemental distribution found secondary-ion mass spectrometry (SIMS) directly indicates ions partially substituted O(2-) into lattice alkaline-earth orthosilicates thus critically improves color-tunable photoluminescence (PL) electroluminescence (EL) efficiency NUV-LEDs. The newly "the effect" on large PL EL enhancement may provide a platform discovery new efficient phosphors solid state lighting.