Room-temperature green to orange color-tunable upconversion luminescence from Yb3+/Mn2+ co-doped CaO

• Published in: Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2016-11, Vol.4 (42), p.1154-116
• Main Authors: Wang, J. L, Song, E. H, Wu, M, Dai, W. B, Jiang, X. F, Zhou, B, Zhang, Q. Y
• Format: Article
• Language: English
• Subjects: Decay; Design engineering; Emission; Emission analysis; Excitation; Illumination; Luminescence; Upconversion
• ISSN: 2050-7526; 2050-7534
• DOI: 10.1039/c6tc02773c

Room-temperature green to orange color-tunable upconversion (UC) luminescence has been achieved from Yb 3+ /Mn 2+ co-doped CaO by adjusting the doping concentration of Mn 2+ ions and the temperature of the samples upon 980 nm laser diode excitation. In this material system, the green UC emission band centered at 508 nm and the wavelength-tunable orange UC emission band from 560 to 725 nm are realized at 980 nm excitation, which originate from the cooperative luminescence of Yb 3+ pairs and the | 2 F 7/2 , 4 T 1 ( 4 G)〉 → | 2 F 7/2 , 6 A 1 (S)〉 transition of exchange-coupled Yb 3+ -Mn 2+ dimers, respectively. The characteristic Stokes and UC emission properties, UC luminescence decay behaviors, temperature-dependent UC emission properties, as well as the involved UC mechanism of CaO:Yb 3+ ,Mn 2+ are investigated and discussed in detail. This study offers a new method to design novel UC materials for lighting and display applications instead of using conventionally investigated lanthanide (Ln 3+ ) ions, such as Er 3+ , Tm 3+ and Ho 3+ . Room-temperature green to orange color-tunable upconversion is achieved from Yb 3+ /Mn 2+ co-doped CaO by adjusting the doping concentration of Mn 2+ ions upon 980 nm diode laser excitation.