Observation of a Te4+ center with broad red emission band and high fluorescence quantum efficiency in TeO2-Li2O glass

Abstract

A B S T R A C TIn this work, a lithium tellurite glass (80TeO 2 − 20Li 2 O, in mol%) was synthesized and its optical properties were analyzed. This glass matrix has been extensively studied, mainly due to its highly nonlinear optical properties, but there have been no reports concerning its luminescence properties. To the best of our knowledge, this is the first observation of visible emission related to Te 4+ centers in a lithium tellurite glass. A broad and intense emission band was centered at 650 nm and there was a broad excitation band in the UV-Vis region. The emission lifetime at room temperature was approximately 7.0 ± 0.2 μs and the fluorescence quantum efficiency was 63 ± 6%. These characteristics indicated that the system consisting of Te 4+ centers in lithium tellurite glass is a good candidate as a phosphor material for various applications.

Tunable broadband photoluminescence from bismuth‐doped calcium aluminum germanate glasses prepared in oxidizing atmosphere

“…Transition metal ions with their weakly bound d electrons (such as V 5+ , Ti 4+ , Cu + , Mn 2+ , Cr 4+ , Co 2+ , Ni 2+ , and Ag + ), [13][14][15][16][17][18][19][20][21] main group metal ions (such as Pb + , Sn 2+ , Bi 3+ , Te 4+ , and Sb 3+ ), [22][23][24][25][26][27][28] quantum dots (such as PbS 29 ), and structural defects (such as oxygen vacancies 30 ) present such alternatives. Among these, bismuth (Bi) ions are of particular interest due to their large variability in terms of the oxidation state that can be stabilized in glass matrices.…”

Structure of lithium tellurite and vanadium lithium tellurite glasses by high-energy X-ray and neutron diffraction

“…The present study reports results on the effects of addition of small amounts of V 2 O 5 (1 to 5 mol%) on the short-range structure and thermal properties of xLi 2 O-(100 À x)TeO 2 glasses. Lithium tellurite glasses are excellent materials for optical applications (Hirdesh & Khanna, 2018;Costa et al, 2018) (Dean, 1999) and, hence, V 2 O 5 can increase the glass transition temperature and also the electronic conductivity since xV 2 O 5 -(100 À x)TeO 2 glasses are semiconducting and show significant electronic conduction (Baia et al, 2004;Dimitriev & Dimitrov, 1978). The xV 2 O 5 -yLi 2 O-(100 À x À y)TeO 2 glasses have potential applications as cathode materials in lithium ion batteries due to their open structure for Li + intercalation (Rozier et al, 2005;Krins et al, 2006).…”

“…Lithium tellurite glasses are efficient host materials of rare earth ions for luminescence applications (Hirdesh & Khanna, 2018;Costa et al, 2018). Li + conducting glasses find applications in rechargeable batteries, super-capacitors and photochromic windows because the mobility of the cations can be optimized by adjusting their chemical compositions.…”