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Proceedings Paper

Optical properties of Pr3+-, Ce3+-, and Eu2+-doped ternary lead halides
Author(s): Ei E. Brown; Althea Bluiett; Uwe Hömmerich; Sudhir B. Trivedi
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Paper Abstract

The luminescent properties of rare-earth doped solids have been under intense exploration for a wide range of applications ranging from displays and lasers to scintillators. In this work, the material purification, crystal growth, and spectroscopic properties of Ce3+-, and Eu3+- doped KPb2Cl5 as well as Pr3+ doped KPb2Cl5 and KPb2Br5 were investigated for possible applications in infrared lasers and radiation detectors. The studied materials were synthesized through careful purification of starting materials including multi-pass zone-refinement and halogination. The growth of the purified materials was then carried out through vertical or horizontal Bridgman technique. The trivalent praseodymium ion (Pr3+) offers a large number of laser transitions in the visible and infrared (IR) spectral regions. Using ~1.45 μm and 1.9 μm pumping, IR emissions at ~1.6, ~2.4, and ~4.6 μm were observed from Pr: KPb2Cl5 and Pr: KPb2Br5 corresponding to the 4f-4f transitions of 3F4/3F33H4, 3F2/3H63H4, and 3H53H4, respectively. Large emission cross-sections in the range of (4.8-6.1) x 10-20 cm2 (near-IR, ~1.6 μm) and (5.5-6.0) x 10-20 cm2 (mid-IR, ~4.6 μm) were observed for both crystals. Emission characteristics of the ~1.6 μm Pr3+ transition including IR to visible upconversion emission studies were also discussed. Under Xenon lamp excitation, preliminary spectroscopic results showed allowed 5d-4f Ce3+ emission centered at ~375 nm in Ce3+ doped KPb2Cl5. In addition, commercial Ce:YAG and Ce:YAP crystals are included in this study for comparison. Pr3+ and Eu2+ 5d-4f emissions were not observed from Pr3+/Eu2+ doped KPb2Cl5 crystals.

Paper Details

Date Published: 16 March 2015
PDF: 13 pages
Proc. SPIE 9359, Optical Components and Materials XII, 93591U (16 March 2015); doi: 10.1117/12.2079426
Show Author Affiliations
Ei E. Brown, Hampton Univ. (United States)
Althea Bluiett, Elizabeth City State Univ. (United States)
Uwe Hömmerich, Hampton Univ. (United States)
Sudhir B. Trivedi, Brimrose Corp. of America (United States)

Published in SPIE Proceedings Vol. 9359:
Optical Components and Materials XII
Shibin Jiang; Michel J. F. Digonnet, Editor(s)

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