Comparative study of optical and luminescence properties of Sm<sup>3+</sup>-ions doped Li<inf>2</inf>O–Gd<inf>2</inf>O<inf>3</inf>–PbO–SiO<inf>2</inf> and Li<inf>2</inf>O-GdF<inf>3</inf>-PbO–SiO<inf>2</inf> glasses for orange emission solid state device application
© 2020 Elsevier B.V. 25Li2O–05Gd2O3– 15PbO – (55-x) SiO2:x Sm2O3 (LPOSm) and 25Li2O–05GdF3- 15PbO – (55-x) SiO2:x Sm2O3 (LPFSm)glasses were prepared by melt quenching method. Optical, luminescence JO-parameters and radiative properties were studied using various techniques. While comparing Ω2 parame...
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Main Authors: | , , , , , , , |
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Format: | Journal |
Published: |
2020
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Subjects: | |
Online Access: | https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85081125930&origin=inward http://cmuir.cmu.ac.th/jspui/handle/6653943832/68224 |
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Institution: | Chiang Mai University |
Summary: | © 2020 Elsevier B.V. 25Li2O–05Gd2O3– 15PbO – (55-x) SiO2:x Sm2O3 (LPOSm) and 25Li2O–05GdF3- 15PbO – (55-x) SiO2:x Sm2O3 (LPFSm)glasses were prepared by melt quenching method. Optical, luminescence JO-parameters and radiative properties were studied using various techniques. While comparing Ω2 parameter values between LPOSm05 and LPFSm05, the LPFSm05 glass has more asymmetric environment around Sm3+-ions and more covalency between Sm3+-O bonding then LPOSm05 glass. Moreover, LPFSm05 has higher value of branching ratio than LPOSm05 showing its suitability for laser active medium. The current investigation reveals that value of IR/O-ratio for LPFSm05 is more than LPOSm05 showing its more asymmetric nature and more local disorder for Sm3+-ions than LPOSm05 glass. From evaluated results the CIE-color-coordinates for LPOSm and LPFSm glasses fall in orange region. The calculated value of prepared LPOSm and LPFSm glass are less than warm CCT (<4000 K). The lifetime of 4G5/2state atλext = 402 nm and λemi = 600 nm for LPOSm glasses is longer than LPFSm glasses. The dominant interaction responsible for non-exponential behavior for higher concentration in present glasses were found to be dipole-dipole type of interaction for energy transfer between donor (Sm3+) and acceptor (Sm3+) ions. From the present investigation it is suggested that presents glasses are suitable for orange light emitting devices (LEDs and laser). |
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