Microwave-Assisted Solid State Synthesis of Red-Emitting BCNO Phosphor and its Characteristics

Abstract

Red-emitting BCNO phosphor has been synthesized by a microwave-assisted solid state reaction using a low-cost boric acid, urea and polyethylene glycol (PEG-20k) as the starting materials. The effects of reaction parameters: temperature, carbon and nitrogen content on material composition and photoluminescence properties were investigated. Nearly multi-phase hexagonal boron nitride, boron oxide, boron carbide and carbon graphite was observed, indicating the BCNO were successfully synthesized. The photoluminescence spectra of the phosphor excited by a UV light (365 nm) showed a broad emission band at 460 - 620 nm.

Facile Synthesis of BCNO Yellow-Emitting Phosphors Applications for White LEDs by Microwave Heating

“…Similar non-crystalline BCNO phosphors were prepared by Ogi et al through microwave heating [19]. However, crystalline BCNO phosphor was reported in their other work, in which microwave-assisted heat was inserted into the traditional furnace heating procedure [20].…”

“…Much lower temperature and shorter reaction times are prominent for microwave heating than the electric furnace heating in synthesis of BCNO phosphors. To the best of our knowledge, however, there are only a few works pertaining to the microwave synthesis of BCNO phosphors demonstrated by Ogi's group [19,20]. For the luminescent properties, reported works had evidenced that the emission properties for BCNO phosphors are strongly dependent on the synthesize conditions, such as raw materials, sintering temperature, sintering time, and ambient atmosphere.…”

A red emitting of manganese-doped boron carbon oxynitride (BCNO) phosphor materials: facile approach and photoluminescence properties

“…[1][2][3] These excellent properties of the BCNO phosphor offer a great potential application for light emitting diode (LED), panel displays, bio-imaging, and DNA labelling. [3][4][5] The BCNO phosphor material, an intermediate material between graphite and hexagonal-BN, was rst synthesized by our group using a urea combustion method. 1 The main PL mechanism of BCNO is thought to be due to closed-shell BO À and BO 2À anions that act as a luminescence center.…”

“…Several studies have been conducted concerning the attainment of red emission of the BCNO phosphor. [5][6][7][8] Our group successfully obtained near red emission ($571 nm) of BCNO by increasing the polyethylene glycol (PEG) fraction and decreasing the synthesis temperature (700 C). 6 The increased PEG fraction led to the presence of carbon defects in the crystal lattice of the BCNO phosphor through substitution or intercalation.…”