Energy transfer upconversion in Er3+-doped and Er3+, Ho3+ -codoped Cs2NaGdC16 crystals

Dianyuan Wang; Jianglong Luo; Jianqing Liu; Lisheng Yu; Aoqiu Yu; Yanyan Guo; Min Yin

doi:10.1117/12.667151

23 December 2005 Energy transfer upconversion in Er³⁺-doped and Er³⁺, Ho³⁺ -codoped Cs₂NaGdC1₆ crystals

Dianyuan Wang, Jianglong Luo, Jianqing Liu, Lisheng Yu, Aoqiu Yu, Yanyan Guo, Min Yin

Proceedings Volume 6028, ICO20: Lasers and Laser Technologies; 60280S (2005) https://doi.org/10.1117/12.667151
Event: ICO20:Optical Devices and Instruments, 2005, Changchun, China

Abstract

Powder samples Cs₂NaGdCl₆:10%Er³⁺ and Cs₂NaGdCl₆:10%Er³⁺,20%Ho³⁺ investigated were prepared. Upconversion and down-conversion spectra from both Er³⁺ and Ho³⁺ ions was measured and investigated at room temperature under excitation into the ²H_11/2 levels of Er³⁺ ions by using a 514.5 nm Ar⁺ laser. The observed emissions were all clearly assigned and analyzed according to the energy level diagrams of Ho³⁺ and Er³⁺ ions. It was concluded that many emissions with peaks at 423 nm (⁵G₅ -> ⁵I₈), 492 nm (⁵F₃ -> 5I8), 587 nm (⁵G₄ -> ⁵I₆), 657 nm (⁵F₅ -> ⁵I₈) and 760 nm (⁵I₄ -> ⁵I₈) were all from Ho³⁺ ions, although Ho³⁺ ions cannot be excited by a ground-state-absorption (GSA). Therefore, all the emissions from Ho³⁺ ions were caused by multistep energy transfer from Er³⁺ to Ho³⁺ ions. And the 388 nm and 410 nm upconversion emissions were assigned to be ⁴G_11/2->⁴I_15/2 and ²H_9/2->⁴I_15/2 transitions of Er³⁺ ions, respectively. The possible upconversion mechanism for them was deduced to be excitation state absorption (ESA) and energy transfer (ET). In addition, the result that the slopes of 388nm and 410nm upconversion emissions of Er³⁺ ions were smaller in Er³⁺-doped than Er³⁺, Ho³⁺-codoped Cs₂NaGdCl₆ crystals was explained successfully.

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Dianyuan Wang, Jianglong Luo, Jianqing Liu, Lisheng Yu, Aoqiu Yu, Yanyan Guo, and Min Yin "Energy transfer upconversion in Er³⁺-doped and Er³⁺, Ho³⁺ -codoped Cs₂NaGdC1₆ crystals", Proc. SPIE 6028, ICO20: Lasers and Laser Technologies, 60280S (23 December 2005); https://doi.org/10.1117/12.667151

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