Firing Technique for Preparing a BaMgAl10 O 17 : Eu2 +  Phosphor with Controlled Particle Shape and Size

Abstract

The effects of firing temperature on the crystallinity and the luminescent properties of BaMgAl 10 O 17 :Eu 2ϩ phosphor have been investigated over the temperature range 1000-1800ЊC under preparative conditions which do not use any flux such as AlF 3 . The effects of particle shape and size of the ingredient Al 2 O 3 on the phosphor have also been studied under a preparative condition which has a firing temperature of 1700ЊC and does not use any flux. A single-phase BaMgAl 10 O 17 :Eu 2ϩ with sufficient luminescent properties can be obtained over a firing temperature range of 1600-1800ЊC through formation of the intermediate product BaAl 2 O 4 :Eu 2ϩ . Furthermore, the particle shape and size of the ingredient Al 2 O 3 determine the particle shape and size of BaMgAl 10 O 17 :Eu 2ϩ . Hightemperature firing in the absence of any flux has provided for the preparation of a single-phase BaMgAl 10 O 17 :Eu 2ϩ with various particle shapes, such as spherical or platelike, and particle sizes ranging from 2 to 18 m.

Synthesis of Blue‐Emitting CaMgSi2O6:Eu2+ Phosphor Using an Electrostatic Self‐Assembly Deposition Method

“…Recently, Eu 2+ ‐doped CaMgSi 2 O 6 (CMS) has attracted considerable attention as a new blue phosphor for PDPs 4 . This phosphor has been developed to overcome the drawbacks of the conventional blue phosphor, BaMgAl 10 O 17 :Eu 2+ (BAM), which undergoes degradation by ion bombardment or ultraviolet radiation 5–7 . In addition, Eu 2+ ‐doped CMS can also be used as a long phosphorescent phosphor when co‐doped with Dy 3+ 8 …”

Synthesis and characterization of BaMgAl10O17:Eu2+ phosphor prepared by homogeneous precipitation

“…However, its preparation and stability still need further development (Jüstel & Nikol, 2000;Oshio, Matsuoka, Tanaka, & Kobayashi, 1998;Oshio et al, 1999), particularly technological synthesis.…”

“…Conventionally BAM phosphor is synthesized by solid-state methods at temperatures above 1600 • C (Oshio et al, 1998(Oshio et al, , 1999), leading to large particle size with hard agglomerates and incurring high cost, and subsequent ball milling results in irregular shape of particles, contamination and crystal damage, all leading to reduced phosphor luminance efficiency and stability. Alternative preparation techniques have been developed, such as combustion synthesis (Mahakhode, Dhoble, Joshi, & Moharil, 2007), sol-gel process (Zhu et al, 2008), microwave irradiation (Dai, Li, Cai, Xie, & He, 1998), hydrothermal reaction (Ravichandran, Johnson, Erdei, Roy, & White, 1999), co-precipitation (Chen, Sun, Hwang, & Chang, 2006;Zhang, Wang, Du, & Li, 2005), and spray pyrolysis (Jung, Lee, & Kang, 2005;Zhou & Lin, 2005), only few of which, however, have ever achieved good luminescence performance and fine morphology characteristics.…”

Manganese‐Doped Zinc Orthosilicate‐Bearing Phosphor Microparticles with Controlled Three‐Dimensional Shapes Derived from Diatom Frustules

“…Manganese‐doped zinc silicate, for example, is a well‐known photoluminescent, cathodoluminescent, green‐emitting phosphor with a high luminescent efficiency and excellent color purity that has been used in fluorescent lamps, cathode ray tube devices, thin film field emission devices, and plasma devices for lighting, televisions, projection displays, copy machines, flat panel displays, medical imaging, and portable communication equipment 1,2,7–16 . The morphologies (sizes, shapes) of such phosphor particles can have a strong influence on the syntheses, microstructure, and optical performance (e.g., brightness, resolution, color uniformity) of powder‐based phosphor coatings 6,7,17–24 . While a number of synthetic approaches (e.g., solid‐state reaction, sol–gel, polymer precursor, hydrothermal, spray pyrolysis, combustion synthesis 3–5,10,18–22,25,26 ) have been used to generate Mn‐doped Zn 2 SiO 4 powders, the variety and control of three‐dimensional (3‐D) particle shapes afforded by these processes have been rather limited.…”