Luminescence properties of a blue-emitting phosphor: (Sr{sub 1−x}Eu{sub x})Si{sub 9}Al{sub 19}ON{sub 31} (0

Journal Article · Fri Nov 15 04:00:00 EST 2013 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/J.JSSC.2013.09.009· OSTI ID:22274144

Liu, Lihong ^[1]; Xie, Rong-Jun ^[2]; Hirosaki, Naoto; Dierre, Benjamin ^[2]; Sekiguchi, Takashi ^[3]

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1. Structural and Functional Integration of Ceramics Group, The Division of Functional Materials and Nanodevices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang 315201 (China)
2. Sialon Group, Sialon Unit, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044 (Japan)
3. Advanced Electronic Materials Center, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044 (Japan)

Blue-emitting Sr{sub 1−x}Eu{sub x}Si{sub 9}Al{sub 19}ON{sub 31} phosphors were synthesized at 1800 °C for 2 h under 1 MPa N{sub 2} by using the gas-pressure sintering method (GPS). The microstructure, photoluminescence (PL) properties of the prepared phosphors were investigated. Under the 290 nm excitation, broad PL emission bands with peak positions at 448–490 nm were detected. The concentration quenching was not observed owing to the large distance betweenEu{sup 2+} ions that made the nonradiative energy transfer between neighboring Eu{sup 2+} ions difficult. The blue phosphor generally showed a small thermal quenching at low Eu{sup 2+} concentrations. The absorption and external quantum efficiency of the synthesized Sr{sub 0.5}Eu{sub 0.5}Si{sub 9}Al{sub 19}ON{sub 31} were 85% and 62% upon the 365 nm excitation, respectively. The interesting PL results indicate that Sr{sub 1−x}Eu{sub x}Si{sub 9}Al{sub 19}ON{sub 31} has great potentials as a blue phosphor for white LEDs applications. - Graphical abstract: Sr{sub 0.7}Eu{sub 0.3}Si{sub 9}Al{sub 19}ON{sub 31} gives blue-emitting at 471 nm. Excitation spectrum is composed of five bands in the range of 250–450 nm, which are matching well with emission wavelength of UV LEDs. Display Omitted - Highlights: • Blue-emitting Sr{sub 1−x}Eu{sub x}Si{sub 9}Al{sub 19}ON{sub 31} phosphors were synthesized by gas-pressure sintering method. • The concentration quenching was not observed in this phosphor. • This blue phosphor generally showed a small thermal quenching at low Eu{sup 2+} concentrations. • The absorption and external quantum efficiency of the synthesized Sr{sub 0.5}Eu{sub 0.5}Si{sub 9}Al{sub 19}ON{sub 31} were 85% and 62% upon the 365 nm excitation.

• OSTI ID: 22274144
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Vol. 207; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ABSORPTION
EUROPIUM IONS
EXCITATION
MICROSTRUCTURE
PEAKS
PHOSPHORS
PHOTOLUMINESCENCE
QUANTUM EFFICIENCY
QUENCHING
SINTERING
SPECTRA
WAVELENGTHS