Emission analysis of RE3+ (Eu3+, Tb3+ & Ho3+) : B2O3–BaO­LiF/AIF3 glasses

We report here the luminescence spectra of certain rare earth ions (Eu3+, Tb3+ & Ho3+) doped B2O3-BaO-LiF/AiF3 based on the measurements of emission and decay curves of prominent emission transitions. For both the reference host glasses, FTIR, XRD, DTA-TG profiles have been recorded to understand their structural and thermal properties. Eu3+ doped glasses have shown five emission transitions of 5D0 . 7F01,2,3 & 4 located at 580nm, 593nm, 615nm, 655nm and 704nm respectively with an excitation at .exci = 392 nm (7F0 . 5L6). Also under an UV source, these europium glasses have displayed a bright red emission from their surfaces. Tb3+ glasses have exhibited four emission bands of 5D4 . 7F6,5,4,3 at 491nm, 547nm, 588nm and 625nm respectively with an excitation at .exci = 376 nm (7F6 . 5G6). Intense green emission from the glass surfaces has been noticed upon exposure to the UV source. Prominently bluish-green emission has been noticed from the surfaces of the holmium glasses under an UV source and same emission transition (5F4 . 5I8) at 519 nm with an excitation at .exci = 389 nm (5I8 – 5G4) has also been obtained from their measured emission spectra. For all the prominent emissions of the rare earth glasses, decay curves have been measured to compute their lifetimes.Emission analysis of RE3+ (Eu3+, Tb3+ & Ho3+) : B2O3–BaO­LiF/AIF3 glasses B H Rudramadevi and S Buddhudu* Department of Physics, Sri Venkateswara University, Tirupati-517 502, Andhra Pradesh, India E-mail : [email protected] of Physics, Sri Venkateswara University, Tirupati-517 502, Andhra Pradesh, Indi

Spectral and thermal analysis of Sm³⁺ and Dy³⁺: B₂O₃-BaO-LiF/AlF₃ glasses

825-832Optical and thermal properties of Sm³⁺ and Dy³⁺: B₂O₃-BaO-LiF/AlF₃ glasses have been studied. These optical materials have been characterized from the measurement of their XRD, FTIR, absorption, excitation, emission spectra and DTA-TG profiles. From the recorded photoluminescence spectra of samarium (Sm³⁺) glasses, four emission transitions; ⁴G₅/₂ → ⁶H₅/₂ (565 nm), ⁴G₅/₂ → ⁶H₇/2 (601 nm), ⁴G₅/₂ → ⁶H₉/₂ (648 nm) and ⁴G₅/₂ → 6H₁₁/2 (710 nm) with λexci = 401 nm (⁶H₅/₂ → ⁴F₇/₂) have been observed. In the case of dysprosium (Dy³⁺) glasses, three emission transitions; ⁴F₉/₂ → ⁶H₁₅/₂ (485 nm), ⁴F₉/₂ → ⁶H₁₃/₂ (578 nm) and ⁴F₉/₂ → ⁶H₁₁/₂ (667 nm) with lexci = 448 nm (⁶H₁₅/₂ → ⁴I₁₅/₂) have been observed. For the prominent emissions only, the decay curves have been recorded in order to evaluate their lifetimes. The materials nature, structural trends and thermal properties have also been analyzed through the measurement of their XRD, FTIR and TG-DTA profiles

Energy transfer based photoluminescence spectra of Dy3+, Sm3+: PEO+PVP polymer films

Dy3+, Sm3+ ions doped PEO+PVP polymer films and also a host PEO+PVP polymer films have successfully been synthesized by solution casting method. For the PEO+PVP film, its XRD, FTIR, Raman and TG-DTA profiles have been investigated in order to understand its structural and thermal properties. Dy3+ doped film has displayed a blue emission under an UV source. Photoluminescence spectra have been measured to study its optical properties. For observed blue emission at 480 nm (4F9/2→ 6H15/2) of Dy3+ film, its decay curve has been measured in evaluating the lifetime of the blue emission. The Sm3+ polymer film has displayed an orange emission under an UV source. For this Sm3+ film, emission spectra have been measured to evaluate its optical properties. For the orange emission at 600 nm (4G5/2→ 6H7/2) of Sm3+, the transitions of Sm3+ are clearly explained in the form of an energy level diagram. In the co-doped system, an energy transfer between the dopant ions in the host polymer matrix has been explained. These results suggest these films as blue and orange luminescent optical materials

Energy transfer based photoluminescence spectra of Dy³⁺, Sm³⁺: PEO+PVP polymer films

588-596Dy3+, Sm3+ ions doped PEO+PVP polymer films and also a host PEO+PVP polymer films have successfully been synthesized by solution casting method. For the PEO+PVP film, its XRD, FTIR, Raman and TG-DTA profiles have been investigated in order to understand its structural and thermal properties. Dy3+ doped film has displayed a blue emission under an UV source. Photoluminescence spectra have been measured to study its optical properties. For observed blue emission at 480 nm (4F9/2→ 6H15/2) of Dy3+ film, its decay curve has been measured in evaluating the lifetime of the blue emission. The Sm3+ polymer film has displayed an orange emission under an UV source. For this Sm3+ film, emission spectra have been measured to evaluate its optical properties. For the orange emission at 600 nm (4G5/2→ 6H7/2) of Sm3+, the transitions of Sm3+ are clearly explained in the form of an energy level diagram. In the co-doped system, an energy transfer between the dopant ions in the host polymer matrix has been explained. These results suggest these films as blue and <i style="mso-bidi-font-style: normal">orange luminescent optical materials