A Systematic Approach to Achieving High Performance Hybrid Lighting Phosphors with Excellent Thermal- and Photostability

Fang, Yang; Liu, Wei; Teat, Simon J.; Dey, Gangotri; Shen, Zeqing; An, Litao; Yu, Dechao; Wang, Lu; O'Carroll, Deirdre M.; Li, Jing

doi:10.1002/adfm.201603444

A Systematic Approach to Achieving High Performance Hybrid Lighting Phosphors with Excellent Thermal- and Photostability

Journal Article · Wed Dec 07 00:00:00 UTC 2016 · Advanced Functional Materials

DOI:https://doi.org/10.1002/adfm.201603444· OSTI ID:1436618

Fang, Yang ^[1]; Liu, Wei ^[1]; Teat, Simon J. ^[2]; Dey, Gangotri ^[3]; Shen, Zeqing ^[1]; An, Litao ^[1]; Yu, Dechao ^[1]; Wang, Lu ^[1]; O'Carroll, Deirdre M. ^[1]; Li, Jing ^[1]

Rutgers Univ., Piscataway, NJ (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
George Washington Univ., Washington, DC (United States). IMPACT

We have designed and synthesized a family of high-performance inorganic-organic hybrid phosphor materials composed of extended and robust networks of one-, two- and three-dimensions. Following a bottom-up solution-based synthetic approach, these structures are constructed by connecting highly emissive Cu₄I₄ cubic clusters via carefully selected ligands that form strong Cu-N bonds. They emit intensive yellow-orange light with high luminescence quantum efficiency, coupled with large Stokes shift which greatly reduces self-absorption. They also demonstrate exceptionally high framework- and photo-stability, comparable to those of commercial phosphors. The high stabilities are the result of significantly enhanced Cu-N bonds, as confirmed by the DFT binding energy and electron density calculations. Possible emission mechanisms are analyzed based on the results of theoretical calculations and optical experiments. Two-component white phosphors obtained by blending blue and yellow emitters reach an internal quantum yield (IQY) as high as 82% and correlated color temperature (CCT) as low as 2534 K. The performance level of this sub-family exceeds all other types of Cu-I based hybrid systems. The combined advantages make them excellent candidates as alternative rare-earth element (REE) free phosphors for possible use in energy-efficient lighting devices.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1436618

Journal Information:: Advanced Functional Materials, Journal Name: Advanced Functional Materials Journal Issue: 3 Vol. 27; ISSN 1616-301X

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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A Systematic Approach to Achieving High Performance Hybrid Lighting Phosphors with Excellent Thermal- and Photostability

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