Understanding the links between composition, polyhedral distortion, and luminescence properties in green-emitting β-Si6–zAlzOzN8–z:Eu2+ phosphors

Cozzan, Clayton; Laurita, Geneva; Gaultois, Michael W.; Cohen, Marcus; Mikhailovsky, Alexander A.; Balasubramanian, Mahalingam; Seshadri, Ram

doi:10.1039/C7TC03039H

Title: Understanding the links between composition, polyhedral distortion, and luminescence properties in green-emitting β-Si_6–zAl_zO_zN_8–z:Eu²⁺ phosphors

Journal Article · 21 September 2017 · Journal of Materials Chemistry C

DOI: https://doi.org/10.1039/C7TC03039H · OSTI ID:1399266

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^[1]; Cohen, Marcus ^[1]; Mikhailovsky, Alexander A. ^[1]; Balasubramanian, Mahalingam ^[3];

^[1]

Univ. of California, Santa Barbara, CA (United States)
Bates College, Lewiston, ME (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)

Inorganic phosphor materials play a crucial role in the creation of white light from blue and near-UV solid-state light-emitting diodes. Understanding the intricacies of the phosphor structure is key for setting the stage for improved, more efficient functionality. Average structure and coordination environment analysis of the robust and efficient green-emitting phosphor, β-SiAlON:Eu²⁺ (β-Si_6–zAl_zO_zN_8–zEu_0.009), is combined here with a range of property measurements to elucidate the role of Al content (z) in luminescence properties, including the red shift of emission and the thermal quenching of luminescence as a function of increasing Al content z. Average structure techniques reveal changes in polyhedral distortion with increasing z for the 9-coordinate Eu site in β-SiAlON:Eu²⁺. X-ray absorption near edge structure (XANES) is used to confirm that the majority of the activator Eu is in the Eu²⁺ state, exhibiting the symmetry-allowed and efficient 4f⁷5d⁰ → 4f⁶5d¹ transitions. As a result, room temperature and temperature-dependent luminescence indicate a curious increase in thermal stability with increasing z over a small range due to an increasing barrier for thermal ionization, which is correlated to an increase in the quantum yield of the phosphor.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1399266

Journal Information:: Journal of Materials Chemistry C, Vol. 5, Issue 38; ISSN 2050-7526

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Mn ⁴⁺ nonequivalent-doped Al ³⁺ -based cryolite high-performance warm WLED red phosphors Hong, Feng; Xu, Haiping; Yang, Liu New Journal of Chemistry, Vol. 43, Issue 37 https://doi.org/10.1039/c9nj03607e	journal	January 2019
Insight into a novel rare‐earth‐free red‐emitting phosphor Li ₃ Mg ₂ NbO ₆ :Mn ⁴⁺ : Structure and luminescence properties Wang, Xicheng; Zhou, Xiaopeng; Cao, Yaxin Journal of the American Ceramic Society, Vol. 102, Issue 11 https://doi.org/10.1111/jace.16527	journal	May 2019

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Title: Understanding the links between composition, polyhedral distortion, and luminescence properties in green-emitting β-Si6–zAlzOzN8–z:Eu2+ phosphors

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Title: Understanding the links between composition, polyhedral distortion, and luminescence properties in green-emitting β-Si_6–zAl_zO_zN_8–z:Eu²⁺ phosphors