Determination of cross-relaxation efficiency based on spectroscopy in thulium-doped rare-earth sesquioxides

Zheng, Liwen; Wu, Hao; Zhang, Liangliang; Luo, Yongshi; Pan, Guohui; Wang, Xiaojun; Hao, Zhendong; Zhang, Jiahua

doi:10.1016/j.ceramint.2022.11.301

Cited by 6 publications

(1 citation statement)

References 41 publications

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“…Indeed, the cross-relaxation was notably faster compared to radiative transitions from higher levels to 4 F 3/2 one. Indeed, the work [24] estimated time resonant cross-relaxation between Tm 3+ ions from 8 µs (at 1.0% concentration) to 30 µs (at 4.0 % concentration). The contribution of faster cross-relaxation process in population of 4 F 3/2 level increased with the increase in Yb 3+ that led to rising-time shortening.…”

Section: Resultsmentioning

confidence: 99%

Optical Temperature Sensors Based on Down-Conversion Nd3+,Yb3+:LiYF4 Microparticles

et al. 2023

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Nd3+ (0.3 mol.%), Yb3+ (0, 1, 2, 3 and 5 mol.%): LiYF4 phosphors were grown by the Bridgman–Stockbarger technique. The luminescence intensity ratio (LIR) of Nd3+ (4F3/2–4I9/2, ~866 nm) and Yb3+ emission (2F5/2–2F7/2, ~980 nm) was taken as a parameter. The energy exchange between 4F3/2 (Nd3+) and 2F5/2 (Yb3+) occurs via phonons, which elucidates the LIR temperature dependence. The influence of the cross-relaxation process on the temperature sensitivity was estimated as negligible. The LIR function depends on the Yb3+ concentration at a fixed 0.3 mol.% Nd3+. The maximum Sa and Sr value were reached for Nd3+ (0.3%), Yb3+ (1.0%): LiYF4 (Sa = 0.007 K−1 at 320 K) and Nd3+ (0.3%), Yb3+ (5.0%): LiYF4 (Sr = 1, 1.03%*K−1 at 260 K), respectively.

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Section: Resultsmentioning

confidence: 99%

Optical Temperature Sensors Based on Down-Conversion Nd3+,Yb3+:LiYF4 Microparticles

et al. 2023

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Ultrabroadband Near‐Infrared Zn₃Ga₂GeO₈:Cr³⁺, Ni²⁺ Phosphor for PiG pc‐LED

Zheng,

Wu,

Zhao

et al. 2024

Advanced Optical Materials

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Cr3+‐activated broadband near‐infrared (NIR) phosphors are studied extensively for application in phosphor converted light‐emitting diode (pc‐LED), a new light source for substance testing based on NIR spectroscopy. However, the emission of Cr3+ is mainly located in the NIR I region (700–1000 nm) and many substances show the characteristic spectroscopy in the NIR II region (1000–1700 nm). In this paper, dual‐wavelength emission of NIR I and NIR II is realized in Cr3+ and Ni2+ codoped Zn3Ga2GeO8 (ZGGO) via energy transfer from NIR I emitting Cr3+ to NIR II emitting Ni2+. The photoluminescent properties of the doped ZGGO are studied as a function of doping concentration and the optimal concentrations of Cr3+ and Ni2+ are determined to be 0.04 and 0.003, respectively, with internal quantum efficiency (IQE) of 37.5%. The ZGGO:Cr3+, Ni2+ phosphor‐in‐glass (PiG), is prepared for fabricating PiG‐converted ultrabroadband NIR LEDs to avoid serious reabsorption of the NIR II emission as in the pc‐LED packaged using phosphor dispersed epoxy resin or silicone. The PiG pc‐LED offers photoelectric efficiency of 4.3%@20 mA and NIR output power of 17 mW@200 mA and shows stable spectral distribution against drive current compared to pc‐LED.

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Spectroscopy of thulium ions in solid-solution sesquioxide laser ceramics: Inhomogeneous spectral line broadening, crystal-field engineering and C3i sites

Eremeev,

Loiko,

Balabanov

et al. 2024

Optical Materials

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Determination of cross-relaxation efficiency based on spectroscopy in thulium-doped rare-earth sesquioxides

Cited by 6 publications

References 41 publications

Optical Temperature Sensors Based on Down-Conversion Nd3+,Yb3+:LiYF4 Microparticles

Optical Temperature Sensors Based on Down-Conversion Nd3+,Yb3+:LiYF4 Microparticles

Ultrabroadband Near‐Infrared Zn₃Ga₂GeO₈:Cr³⁺, Ni²⁺ Phosphor for PiG pc‐LED

Spectroscopy of thulium ions in solid-solution sesquioxide laser ceramics: Inhomogeneous spectral line broadening, crystal-field engineering and C3i sites

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Determination of cross-relaxation efficiency based on spectroscopy in thulium-doped rare-earth sesquioxides

Cited by 6 publications

References 41 publications

Optical Temperature Sensors Based on Down-Conversion Nd3+,Yb3+:LiYF4 Microparticles

Optical Temperature Sensors Based on Down-Conversion Nd3+,Yb3+:LiYF4 Microparticles

Ultrabroadband Near‐Infrared Zn3Ga2GeO8:Cr3+, Ni2+ Phosphor for PiG pc‐LED

Spectroscopy of thulium ions in solid-solution sesquioxide laser ceramics: Inhomogeneous spectral line broadening, crystal-field engineering and C3i sites

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Ultrabroadband Near‐Infrared Zn₃Ga₂GeO₈:Cr³⁺, Ni²⁺ Phosphor for PiG pc‐LED