Blue-emitting phosphor Ba4OCl6:Eu2+ with good thermal stability and a tiny chromaticity shift for white LEDs. Issue 12 (10th March 2016)

• Record Type: Journal Article
• Authors: Chen, Yan; Pan, Fengjuan; Wang, Meng; Zhang, Xuejie; Wang, Jing; Wu, Mingmei; Wang, Chengxin
• Is Part Of: Journal of materials chemistry. Volume 4:Issue 12(2016)
• Page Start: 2367
• Page End: 2373
• Publication Date: 2016-03-10
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c5tc02806j
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : We develop an intense blue emitting phosphor Ba4 OCl6 :Eu 2+ with good thermal stability and a tiny chromaticity shift. The integrated emission intensity at 373 K and 423 K still remains 92.5 and 83.7%, compared with the intensity at room temperature. Abstract : An intense blue-emitting phosphor, Ba4 OCl6 :Eu 2+, was developed by a solid state reaction at low synthesis temperature. The photoluminescence excitation and emission spectra, concentration effect, thermal-dependent luminescence quenching properties, chromaticity shift, activity energy and luminous efficiency of radiation are investigated. These results show that Eu 2+ exhibits a broadband excitation extending from 250 to 400 nm and emits an intense blue light at 450 nm with a tiny colour chromaticity shift in the temperature range of 350–490 K. The external quantum efficiency of Ba3.97 OCl6 :Eu0.03 2+ is about 26.6%. It demonstrates that Eu 2+ doped Ba4 OCl6 can be excited by an n-UV LED chip and is an effective blue-emitting phosphor potentially useful in white LEDs.