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신수철,조태환,Shin, Su-Cheol,Cho, Tae-Hwan 한국재료학회 2003 한국재료학회지 Vol.13 No.8
($Y_{l-x}$ $Gd_{x}$ )$O_2$$_3$: $Eu^{ 3+}$ red phosphors were prepared with the solvothermal synthesis using the 2-methoxy-ethanol solvents and the emission intensity was investigated that applied with the 254 nm wavelength and the maximum excitation wavelength for energy source. The used solvents for the solvothermal synthesis were made of nitrate salt solutions of Y, Gd and Eu. These solutions dropped in autoclave have be reacted with the solvothermal synthesis at $200^{\circ}C$ for 5hrs and the red phosphors prepared here in were showed the pure cubic phase after annealing at $1000∼1200^{\circ}C$. The brightness of ($Y_{l-x}$ $Gd_{x}$)$_2$$O_3$: $Eu^{3+}$ phosphors particles was increased as an increase of Gd ratio. The maximum excitation wavelengths of ($Y_{l-x}$ $Gd_{x}$ )$_2$$O_3$: $Eu^{3+}$ / phosphors particles were increased according to increasing Gd ratio from 253 nm to 259 nm wavelength. The maximum emission intensity of $Gd_2$$O_3$: $Eu^{3+}$ (Y/Gd = 1/0) phosphors particles under UV 259 nm was found to be higher than the commercial product of $Y_2$$O_3$: $Eu^{3+}$ phosphors.
신수철,조태환 한국화학공학회 2003 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.41 No.5
에틸렌디아민을 용매로 하여 용매열합성으로 200℃에서 1-5시간 반응시킨 후 1,000℃에서 1,400℃로 2-4시간 동안 대기중에서 열처리 과정으로 Eu가 도핑 된 Y₂O₃ 나노 입자를 제조하였다. 1,000℃에서 2시간 동안 열처리한 결정의 X선 회절패턴은 보고 된 데이터(JCPDS 카드파일 41-1105, a=10.60418 Å)와 거의 일치하는 격자상수 a=10.6029 Å인 순수한 큐빅상의 Y₂O₃을 나타내었다. 제조된 형광체의 평균입자 크기는 대략 100 nm로 구형의 형태를 가진다. 열처리 온도가 증가함에 따라 형광체 입자의 크기가 감소하였으며, 또한 형광체의 발광 세기가 증가하였다. PL 스펙트럼 분석 결과, Eu의 농도가 3% 도핑 된 Y_(2-x)O₃:Eu^(3+)_(x) (x=0.06) 형광체는 250 nm파장에서 여기 스펙트럼을 나타내었고, 611 nm 파장에서 주발광 스펙트럼을 나타내었다. Eu doped Y₂O₃ nanoparticles were prepared with the solvothemal synthesis using ethylenediamine solvent at 200℃ for 1-5 h and then annealed in air at from 1,000℃ to 1,400 for 2 4 h. The X-ray diffraction pattern of the crystals annealed at 1,000℃ for 2 h could be indexed as pure cubic cell of Y₂O₃ with the lattice parameter a=10.6029 Å which is very close to the reported value (JCPDS Card File 41-1105, a=10.6041 Å). Average sizes of prepared phosphor particles had about 100 nm, size and spherical morphology. The phosphor panicle size decreased and the emission intensity increased as the annealing temperature increased. Through PL spectrum analysis, the 3% Eu doped Y_(2-x)O₃:Eu_(x)^(3+)(x=0.06) phosphor showed the excitation spectrum at 250 nm wavelength and the maximum emission spectrum appeared at 611nm wavelength.