Intense red photoluminescence from Mn2+-doped (Na+; Zn2+) sulfophosphate glasses and glass ceramics as LED converters

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Details zur Publikation

Autorinnen und Autoren: Da N, Peng M, Krolikowski S, Wondraczek L
Zeitschrift: Optics Express
Jahr der Veröffentlichung: 2010
Band: 18
Heftnummer: 3
ISSN: 1094-4087


Abstract

We report on intense red fluorescence from Mn2+-doped sulfophosphate glasses and glass ceramics of the type ZnO-Na$_2$O-SO$_3$-P$_2$O5. As a hypothesis, controlled internal crystallization of as-melted glasses is achieved on the basis of thermally-induced bimodal separation of an SO$_3$-rich phase. Crystal formation is then confined to the relict structure of phase separation. The whole synthesis procedure is performed in air at $łeq$ 800 °C. Electron spin resonance and Raman spectroscopy indicate that Mn2+ species are incorporated on Zn2+ sites with increasingly ionic character for increasing concentration. Correspondingly, in the glasses, increasing MnO content results in decreasing network polymerization. Stable glasses and continuously increasing emission intensity are observed for relatively high dopant concentration of up to 3 mol.%. Recrystallization of the glass results in strongly increasing emission intensity. Dynamic emission spectroscopy reveals only on type of emission centers in the glassy material, whereas three different centers are observed in the glass ceramic. These are attributed to octahedrally coordinated Mn2+ in the residual glass phase and in crystalline phosphate and sulfate lattices, respectively. Relatively low crystal field strength results in almost ideal red emission, peaking around 625 nm. Excitation bands lie in the blue-to-green spectral range and exhibit strong overlap. The optimum excitation range matches the emission properties of GaN- and InGaN-based light emitting devices.


FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Da, Ning
Professur für Werkstoffwissenschaften (Glas und Keramik)
Krolikowski, Sebastian
Lehrstuhl für Werkstoffwissenschaften (Glas und Keramik)
Wondraczek, Lothar Prof. Dr.-Ing.
Professur für Werkstoffwissenschaften (Glas und Keramik)


Zusätzliche Organisationseinheit(en)
Exzellenz-Cluster Engineering of Advanced Materials


Forschungsbereiche

C Photonic and Optical Materials
Exzellenz-Cluster Engineering of Advanced Materials


Zitierweisen

APA:
Da, N., Peng, M., Krolikowski, S., & Wondraczek, L. (2010). Intense red photoluminescence from Mn2+-doped (Na+; Zn2+) sulfophosphate glasses and glass ceramics as LED converters. Optics Express, 18(3). https://dx.doi.org/10.1364/OE.18.002549

MLA:
Da, Ning, et al. "Intense red photoluminescence from Mn2+-doped (Na+; Zn2+) sulfophosphate glasses and glass ceramics as LED converters." Optics Express 18.3 (2010).

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