Performance of Chromium Doped Zinc Selenide Nanocrystals: Morphological and Fluorescence Characteristics

Singh, N. B.; Su, Ching Hua; Arnold, Bradley; Choa, Fow-Sen; Setera, Brett; Sachs, David; Cooper, Christopher; Kelly, Lisa A.; Mandal, K. D.

doi:10.1007/978-3-030-65261-6_87

Cited by 3 publications

(2 citation statements)

References 10 publications

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“…The color of the colloidal/precipitate layer was a green-grey settled in the bottom portion of the reaction container. Previous studies compared the pre-capping and post-capping addition of thioglycerol in the solution and its effect is reported in the reference [16].…”

Section: Synthesis and Morphological Characteristics Of Cr-doped Znse...mentioning

confidence: 99%

Comparative Study of Bulk and Nanoengineered Doped ZnSe

Setera

Arnold

et al. 2022

Crystals

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Chromium- and cobalt-doped zinc selenide nanoparticles were synthesized using a low-temperature reactive solution growth method. The morphological and optical characteristics were compared to those of doped zinc selenide (ZnSe) bulk crystals grown by the physical vapor transport (PVT) method. We observed agglomeration of particles; however, the thioglycerol capping agent has been shown to limit particle grain growth and agglomeration. This process enables doping by addition of chromium and cobalt salts in the solution. A slightly longer refluxing time was required to achieve cobalt doping as compared with chromium doping due to lower refluxing temperature. The nanoparticle growth process showed an average particle size of approximately 300 nm for both Cr- and Co-doped zinc selenide. The optical characterization of Co:ZnSe is ongoing; however, preliminary results showed a very high bandgap compared to that of pure ZnSe bulk crystal. Additionally, Co:ZnSe has an order of magnitude higher fluorescence intensity compared to bulk Cr:ZnSe samples.

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Section: Synthesis and Morphological Characteristics Of Cr-doped Znse...mentioning

confidence: 99%

Comparative Study of Bulk and Nanoengineered Doped ZnSe

Setera

Arnold

et al. 2022

Crystals

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“…The traditional methods such as XRD, TEM, AFM, SEM PL and other characterization methods are time consuming and costly. A large number of papers have been published on the growth and characterization of transition metal doped ZnSe crystals by Su et al [1][2][3][4][5][6][7]. The role of transition metals in determining the concentration driven change in optical performance and electrical parameters due to doping.…”

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confidence: 99%

All optical approach to determine quality and performance of sensor material

Setera

Brandt

Emge

et al. 2023

Smart Biomedical and Physiological Sensor Technology XX

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We have observed that inhomogeneity can affect the refringence and emission significantly. We are investigating refractive index and the absorption coefficients of multi-functional sensor materials to understand the defect driven changes using birefringence interferometry. In order to simplify and faster data collection, we are exploring low-cost reflectance probe fiber optics designed in-house. In this presentation we will compare the data obtained by using this new system with available literature data. In this paper we will report results of doped ZnSe crystals grown by physical vapor transport method.

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Morphology and Luminescence Properties of Transition Metal Doped Zinc Selenide Crystals

Bowman,

Scheurer,

Arnold

et al. 2024

J Fluoresc

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Zinc selenide is an excellent matrix material to dope with rare-earth and transition metal to achieve mid-infrared luminescence to develop high power lasers. The luminescence, morphology and refractive index is significantly affected by the doping and defects generated due to size and valency of dopants, concentration, growth process and convection during the growth. The aim of the study is to investigate effect of point and line defects generated due to low doping of iron and chromium on the emission and morphology of the zinc selenide. Luminescence and morphological properties of large iron and chromium doped zinc selenide single crystals were studied to evaluate the effect of extremely low residual impurities and defects associated with the doping process. The emission properties following both short wavelength (i.e., ultraviolet; 350–370 nm) excitation and longer wavelength (i.e., near infrared; 850–870 nm) excitation were characterized. Luminescence emission bands were identified in both doped crystals. In addition to the primary emission bands, satellite peaks and intra-center transitions were also observed. Due to local population defects associated with the residual impurities (ppm to ppb) in the Fe-ZnSe and Cr-ZnSe crystals, peak emission wavelengths were observed to shift. The emission bands were found to decrease in intensity due to recombination of residual impurity co-dopants and complex defects generated during growth and fabrication. Cryogenic temperature analyses revealed a very clean emission band due to freezing of some of the point and line defects. An emission band observed at 980 nm for both crystals at room temperature as well as cryogenic temperatures indicates a vibronic peak in ZnSe. The scanning electron microscopy (SEM) images of the local morphology support the conclusion that small crystallites in doped crystals are also present.

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Performance of Chromium Doped Zinc Selenide Nanocrystals: Morphological and Fluorescence Characteristics

Cited by 3 publications

References 10 publications

Comparative Study of Bulk and Nanoengineered Doped ZnSe

Comparative Study of Bulk and Nanoengineered Doped ZnSe

All optical approach to determine quality and performance of sensor material

Morphology and Luminescence Properties of Transition Metal Doped Zinc Selenide Crystals

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