초록

PDP용 청색형광체 저가 생산 공정 개발을 위한 연구과제에 대한 최종연구개발의 내용과 범위는 다음과 같다.
- 휘도 및 열화특성 개선
- 균일한 분체 합성 조건 도출 (공동연구분)
- 합성된 분체의 물리·화학, 형광 및 열화 특성 분석
- 중급원료의 전처리 공정 개발
- 저가 생산 공정 (공동연구분)
- PDP 패널시험으로 특성 검증

Abstract ▼

$BaMgAl_{10}O_{17}:Eu^{2+}$(BAM) is widely used as blue phosphor of plasma display Panel(PDP). It is well known that BAM raise easily thermal degradation due to oxidation of $Eu^{2+}$from heat treatment at 450∼550℃ in air during heat Processing. But there have been few result n

$BaMgAl_{10}O_{17}:Eu^{2+}$(BAM) is widely used as blue phosphor of plasma display Panel(PDP). It is well known that BAM raise easily thermal degradation due to oxidation of $Eu^{2+}$from heat treatment at 450∼550℃ in air during heat Processing. But there have been few result not only to make clear the mechanism of thermal degradation but also to understand the phenomemon. In result, $BaMgAl_{10}O_{17}:Eu^{2+}$ has been a key of achieving high PDP efficiency under vacuum ultraviolet light excitation in recent years. This study was done to improve thermal degradation and brightness of blue phosphor of plasma display panel(PDP). To this, new structure was designed using β-Al₂O₃ structure of BAM as following
1. Structure design to strengthen spinel block
2. Structure design to strengthen mirror plane
3. Structure design to lower temperature of heat processing
This phosphors (containing various trivalent elements and Ti, Ta and SiO₂, B₂O₃) was prepared by the solid state reaction for 2hr at 1400∼1450℃ under reducing atmosphere. Characteristic of Prepared phosphors was investigated using the photoluminescence(PL) , neutron and X-ray powder diffraction with Rietveld refinement, electron paramagnetic resonance(EPR) and S-ray absorption near edge structure(XANES). In addition, the electron density distributions were also done by MEED(Maximum Entropy Electron Density)Linux program to optimize the modeling of the structural analysis. In photoluminescence(PL) analysis, Phosphors prepared by substituting $Eu^{2+}$ and trivalent elements(La, Sm, Dy, Ho, Gd, Nd, Y etc) for Ba2+ indicated lower brightness than that of commercial blue phosphor(kasei blue phosphor) at room temperature, but when they were heated at 450℃ for 1hr, their brightness increased greatly. Especially $(Ba_{0.9}Eu_{0.15})MgAl_{10}O_{17}$ indicated brightness similar to commercial blue phosphor. The Rietveld refinement showed that Oxygen defects disappeared all after heating at 450℃. This is assumed to cause increase of $(Ba_{0.9}Eu_{0.15})MgAl_{10}O_{17}$ brightness. The MEED revealed the atoms' position and the electron density distributions in BAM. $Eu^{2+}$ ions substituted $Eu^{2+}$ ions sites. EPR and XANES disclosed that some part of $Eu^{2+}$ ions were oxidation to $Eu^{3+}$ ions during heat treatment.

목차 Contents

• 제 1 장 서 론...14
• 제 2 장 PDP 형광체...16
• 2.1 PDP의 역사 및 특징...16
• 2.2 PDP의 원리, 구조 및 제조 공정...19
• 2.3 PDP용 형광체...22
• 제 3 장 연구수행내용 및 결과...25
• 3.1 휘도 및 열화특성개선...25
• 3.2 균일한 분체 합성조건도출 (공동연구기관)...30
• 3.3 합성된 분체의 물리, 화학, 형광 및 열화특성분석...30
• 3.4 중급원료의 전처리 공정개발...63
• 3.5 저가생산공정 (공동연구기관)...68
• 3.6 패널 제조 공정...68
• 제 4 장 결론...75
• 참고문헌...76