Tunable white light generation from Ce³⁺-Tb³⁺-Mn²⁺ doped metaphosphate glass for LED and solar cell applications

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• 作者：Debarati Ghosh^a ; ^b ; K. Biswas^a ; ^b ; S. Balaji^a ; ^b ; K. Annapurna^a ; ^b ; ^{annapurnak@cgcri.res.in}
• 关键词：Metaphosphate glass ; Frequency downshifting ; White light emission ; White LEDs ; Luminescent concentrator
• 刊名：Journal of Luminescence
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：183
• 期：Complete
• 页码：143-149
• 全文大小：1868 K
• 卷排序：183

文摘

Alkali free Ba-Al metaphosphate glasses doped with Ce, Tb and Mn are prepared and their concentration is tuned to achieve white light emission for production of LEDs and luminescent concentrator for Si-PV applications. The occurrence of a redox reaction among dopant ions (Ce4+, Tb3+→Ce3+, Tb4+) is observed from the absorption spectra while there is no change in oxidation state of Mn2+ ions. This is confirmed from ESR studies. Emission spectra indicated effective downshifting of radiation from near visible to green and red region of the spectrum. On tuning the concentration of Tb3+ and Mn2+, bright white light emission (CIE coordinates: x=3.32, y=3.33) corresponding to CCT of 5900 K is obtained. This white light produced has been further tuned to different hues by varying the excitation wavelength of this triply doped glass.