Blue, green, red upconversion luminescence and optical characteristics of rare earth doped rare earth oxide and oxysulfide

• Published in: Science China. Chemistry Vol. 50; no. 4; pp. 505 - 513
• Main Authors: Luo, XiXian, Cao, WangHe
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer Nature B.V 01.08.2007; Oploelectronic Technology Institute,Dalian Maritime University,Dalian 116026,China
• Subjects: Brightness; Cold pressing; Emitters; Erbium; Luminescence; Optical properties; Phosphors; Rare earth oxides; Semiconductor lasers; Size distribution; Upconversion; Ytterbium; Yttrium oxide; rare eanh oxide; upconversion; optical characteristics; rare earth oxysulfide
• ISSN: 1006-9291; 1674-7291; 1862-2771; 1869-1870
• DOI: 10.1007/s11426-007-0067-z

The cold isostatic press pretreatment process was adopted to prepare fine rare earth oxysulfide up-conversion phosphors with spherical shape, narrow size distribution and high luminescence efficiency. The upconversion optical characteristics and brightness of the blue (Y2O2S:Yb, Tm), green (Y2O2S:Yb,Er), red (Y2O3:Yb,Er) emitter were also investigated, and a novel method was successfully developed for the brightness measurement of upconversion luminescence (UPL). It is shown that a white color can be obtained by the appropriate mixture of these primary blue, green and red emissions components. The Er3+ ions exhibit different upconversion mechanism in Y2O2S and Y2O3 host materials. The rare earth oxysulfide is an efficient upconversion matrix. The UPL brightness of Y2O2S:Yb,Er is 6.5 times higher than that of Y2O3:Yb,Er, and Y2O2S:Yb,Er shows UPL brightness of 1100 cd/m2 under 5.56 W/cm2 power density using a 980 nm laser diode.