Preparation and properties regulation of(Lu0.99-xYxBi0.01)2 WO6 broadband green phosphors and their application in high color rendering index white light LEDs
WANG Xuejiao
FENG Xiaowen
WANG Jiantong
TENG Yuhan
WANG Bowen
GONG Changshuai
Abstract：The development of high quality broadband green phosphor is the key to overcome"cyan gap"issue of phosphors conversion white LED(pc-wLED)and achieve high quality solid state lighting.Herein,a novel(Lu0.99-xYxBi0.01)2WO6 broadband green phosphors with uniform size and good dispersion were prepared by high-temperature solid state method.The phase,morphology and luminescence properties of the phosphors were regulated by the strategy of co-doping Y3+,and the resulting samples were systematically investigated by X-ray diffraction,Rietveld structure refinement,field emission scanning electron microscopy and photoluminescence.The(Lu0.99-xYxBi0.01)2WO6 phosphor shows broadband excitation,and the excitation range covers the wavelength region of 200～400 nm,which can correspond well with commercial UV LEDs.Under the excitation of 346 nm,the(Lu0.99-.YxBi0.01)2WO6 phosphor shows broadband green emission in the range of 400～800 nm,with the full width at half maxima(FWHM)up to 135 nm and the most intense peak at about 510 nm,which corresponds to the 3P1→1S0 transition of Bi3+.Y3+doping significantly improved the crystallinity and luminescence intensity of the(Lu0 99-x YxBi0.01)2WO6 samples.The obtained(Lu0.94 Y0.05 Bi001)2WO6 broadband green phosphor was mixed with commercial CaAlSiN3:Eu2+red phosphor and BaMgAl10O17∶Eu2+blue phosphor,and combined with the 365 nm UV chip to fabricate high-performance warm white LED devices,which have high color rendering index(Ra=96,R9=94)and low correlated color temperature(CCT=3 846 K).
Keywords：broadband green-emittingphosphorpc-wLEDsolid state method
Publication Date：2023-09-15
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：13( 211-223 )