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Green light tuning by up-conversion emission in Er3+-doped tellurite glasses for enhanced light-emitting devices.

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Title: Green light tuning by up-conversion emission in Er3+-doped tellurite glasses for enhanced light-emitting devices.
Authors: Angulo S., F.1 (AUTHOR) 2018001157@unfv.edu.pe, Lozano C., G.1,2 (AUTHOR), Chacaliaza-Ricaldi, J.1,3,4 (AUTHOR), Fuertes, V.5 (AUTHOR), Marega Jr., E.3 (AUTHOR), Rivera, V.A.G.1,3 (AUTHOR) vgarcia@ifsc.usp.br
Source: Optical Materials. Oct2026, Vol. 178, pN.PAG-N.PAG. 1p.
Subjects: Doped glasses, Luminescence, Radiative transitions, Chromaticity, LED lighting
Abstract: Light sources based on glasses with luminescence in the green region, e.g. 500–550 nm, are very important for a wide gamut of applications, including solid-state lighting, visible light communications, flow cytometry, optogenetics, and so on. In this way, a series of Er3+-doped tellurite glasses were synthesized to investigate their green up-conversion emission properties as function of Er3+ concentration under 980 nm power pumping. Such influence on the emission profile and chromaticity was analyzed in correlation with the physical and optical properties of the host. Judd-Ofelt analysis confirmed an improvement in the red emission band, establishing a favorable radiative environment. This intrinsic characteristic enables the tuning of the overall emission across green and yellowish-green hues. Consequently, spectroscopic analysis revealed a tunable emission: shifting towards warmer tones with increasing dopant concentration, whereas increasing excitation power shifts the emission towards cooler green hues. Furthermore, the glasses exhibit high color purity and tunable correlated color temperature. Notably, at higher Er3+ concentrations, the samples exhibited enhanced chromatic stability against excitation power variations. These characteristics demonstrate the potential of these glasses for developing solid-state lighting devices that combine compositional color tunability and high operational stability. • Higher branching ratios identify visible Er3+ transitions as strong laser emission candidates. • Quality factor reveals enhanced radiative (4F 9/2 , 2H 11/2) → 4I 15/2 transitions. • Green-to-red ratio becomes excitation-power independent, at higher Er3+ concentration, reaching ∼ 0.86. • The color purity converges to ∼ 96.5 with increasing Er3+ concentration and excitation power. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Light sources based on glasses with luminescence in the green region, e.g. 500–550 nm, are very important for a wide gamut of applications, including solid-state lighting, visible light communications, flow cytometry, optogenetics, and so on. In this way, a series of Er3+-doped tellurite glasses were synthesized to investigate their green up-conversion emission properties as function of Er3+ concentration under 980 nm power pumping. Such influence on the emission profile and chromaticity was analyzed in correlation with the physical and optical properties of the host. Judd-Ofelt analysis confirmed an improvement in the red emission band, establishing a favorable radiative environment. This intrinsic characteristic enables the tuning of the overall emission across green and yellowish-green hues. Consequently, spectroscopic analysis revealed a tunable emission: shifting towards warmer tones with increasing dopant concentration, whereas increasing excitation power shifts the emission towards cooler green hues. Furthermore, the glasses exhibit high color purity and tunable correlated color temperature. Notably, at higher Er3+ concentrations, the samples exhibited enhanced chromatic stability against excitation power variations. These characteristics demonstrate the potential of these glasses for developing solid-state lighting devices that combine compositional color tunability and high operational stability. • Higher branching ratios identify visible Er3+ transitions as strong laser emission candidates. • Quality factor reveals enhanced radiative (4F 9/2 , 2H 11/2) → 4I 15/2 transitions. • Green-to-red ratio becomes excitation-power independent, at higher Er3+ concentration, reaching ∼ 0.86. • The color purity converges to ∼ 96.5 with increasing Er3+ concentration and excitation power. [ABSTRACT FROM AUTHOR]
ISSN:09253467
DOI:10.1016/j.optmat.2026.118208