Two-step synthesis of a novel red-emitting Ba2ZrF8:Mn4+ phosphor for warm white light-emitting diodes

Journal Article · Thu Nov 15 04:00:00 EST 2018 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2018.07.031· OSTI ID:22805301

Gu, Ming; Tian, Yue; Cui, Cai’e; Huang, Ping; Wang, Lei; Shi, Qiufeng ^[1]

---

1. Key Laboratory of Advanced Transducers and Intelligent Control System of Ministry of Education, College of Physics and Optoelectronics, Taiyuan University of Technology, 030024 Taiyuan (China)

Highlights: • A novel red-emitting Ba{sub 2}ZrF{sub 8}:Mn{sup 4+} was prepared by two-step method at low temperature. • The phosphor shows an intense red emission under 460 nm excitation matching well with blue LED chip. • The energy transfer between Mn{sup 4+} was confirmed to be electric dipole-quadrupole interaction. - Abstract: A novel red-emitting Ba{sub 2}ZrF{sub 8}: Mn{sup 4+} phosphor was prepared by two-step method at low temperature, where critical precursor K{sub 2}MnF{sub 6} was prepared first by the reduction of KMnO{sub 4} using H{sub 2}O2 as reducer. The crystal structure and morphology of the phosphor was characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) equipped with energy-dispersive X-ray spectroscopy (EDS), showing single phase product. Luminescent properties of the phosphor were investigated by photoluminescence spectroscopy (PL) and decay curves. The molar ratio of KMnO{sub 4}: KHF{sub 2} was confirmed to play the key role in improving the luminous efficiency. More importantly, the phosphor exhibits a broadband excitation from 300 to 520 nm due to {sup 4}A{sub 2g}→{sup 4}T{sub 1g} and {sup 4}A{sub 2g}→{sup 4}T{sub 2g} transition of Mn{sup 4+}, matching well with blue LED chips. Under 465 nm excitation, intense red emission at around 630 nm with high color purity is achieved, suggesting the red-emitting phosphor has great potential for white light-emitting diodes (wLEDs).

• OSTI ID: 22805301
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Vol. 107; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COLOR
CRYSTAL STRUCTURE
ELECTRIC DIPOLES
ENERGY TRANSFER
EXCITATION
LIGHT EMITTING DIODES
MANGANESE IONS
MORPHOLOGY
PHOSPHORS
PHOTOLUMINESCENCE
QUADRUPOLES
SCANNING ELECTRON MICROSCOPY
SYNTHESIS
TEMPERATURE RANGE 0065-0273 K
X-RAY DIFFRACTION
X-RAY SPECTROSCOPY