Efficient and stable Sr3Eu2B4O12 red phosphor benefiting from low symmetry and distorted local environment. Issue 10 (25th February 2020)

• Record Type: Journal Article
• Authors: Li, Gui-Hua; Yang, Nian; Guo, Jian-Gang; Wang, Zheng-Liang; Cai, Ge-Mei; Wang, Xiao-Jun
• Is Part Of: Dalton transactions. Volume 49:Issue 10(2020)
• Page Start: 3260
• Page End: 3271
• Publication Date: 2020-02-25
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c9dt04769g
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : In Sr3 Eu2 B4 O12 phosphor with 100% activator Eu 3+, the disorderly co-occupation of Sr and Eu evokes excellent thermal stability and perfect color purity. This new red phosphor is applied to fabricate a warm WLED with good color rendering index. Abstract : The development of suitable red phosphors to obtain improved white color stands a good chance to serve in the new generation of white light-emitting diodes. Owing to multi-elements via doping and oxidation of reduced valence state of lanthanide or transition metal ions, most of the reported phosphors usually suffer from complex synthetic processes and unstable color of the lighting industry cycle. In this work, we present a new red emitting and stable Sr3 Eu2 B4 O12 phosphor with regard to its special structure. It crystallizes as an orthorhombic cell, with Sr and Eu atoms co-occupying three different lattice sites in the space group of Pnma (no. 62). It is proposed that the long bond distance between activators minimizes the content quenching, while the high disorder of location restricts the thermal quenching. This phosphor emits bright red light with good color purity under UV excitation, with the luminescence intensity and quantum yield tunable via the fabrication temperature. Through a preliminary optimization of the synthesis process, the Sr3 Eu2 B4 O12 phosphor prepared at 1250 °C has high quantum yields of about 94.7% and excellent thermal stability of 85.6% intensity retention at 150 °C relative to the initial value at room temperature. The calculated Judd–Ofelt intensity parameters ( Ω 2, Ω 4 ) further clarified that the Eu 3+ site in Sr3 Eu2 B4 O12 had lower symmetry without an inversion center, and more distorted local environment and structural rigidity of the host, predicting excellent thermal stability. Finally, a warm pc-WLED device has been produced by mixing as-prepared Sr3 Eu2 B4 O12 powders and commercial BaMgAl10 O17 :Eu 2+ and (Sr, Ba)2 SiO4 :Eu 2+ phosphors, which exhibits a high color rendering index ( R a = 83.4) along with a color temperature at around 4102 K. The present work indicates that the Sr3 Eu2 B4 O12 phosphor is an efficient red component with excellent thermal stability for white-light production of near-UV-excited w-LEDs.