Vis-NIR luminescence emission via energy-transfer in Tm³⁺/Er³⁺ and Tm³⁺/Nd³⁺ codoped glass under 1.319 µm excitation

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• 作者：Artur da Silva Gouveia-Neto ; ^{asgouveianeto@hotmail.com" class="auth_mail" title="E-mail the corresponding author} ; ^{artur@fis.ufal.br" class="auth_mail" title="E-mail the corresponding author} ; M.V.D. Vermelho ; C. Jacinto
• 关键词：Upconversion ; Phosphor ; Luminescence ; Biological-window ; Energy-transfer
• 刊名：Journal of Luminescence
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：172
• 期：Complete
• 页码：275-278
• 全文大小：502 K

文摘

Emission of visible and NIR frequency upconversion luminescence light mainly within the first biological window spectral region using excitation at 1319 nm in the second biological window in Tm³⁺/Er³⁺-codoped TeO₂-based glass, is demonstrated. For Tm³⁺/Er³⁺-codoped tellurite glass samples, green(525, and 550 nm), red(660 nm) and NIR(980 nm) owing to erbium ions in addition to the main 800 nm signal originating from thulium ions is readily observed. Here, energy-transfer Tm³⁺[³F₄]+Er³⁺[⁴I_15/2]→Tm³⁺[³H₆]+Er³⁺[⁴I_9/2] producing the NIR emission, followed by excited-state absorption of 1.319 µm photons populating ²H_11/2, ⁴S_3/2, and ⁴F_9/2 visible emitting levels. Erbium single-doped samples did not exhibited visible detectable emissions for excitation powers as high as 1.8 W of cw radiation at 1.319 µm. In Tm³⁺/Nd³⁺-codoped samples, energy-transfer from Tm³⁺ (³H₆–³F₄) to Nd³⁺ ions populates the ⁴F_3/2 excited-state level producing NIR emission around 880 nm.