Abstract
The new green $Al_3GdB_4O_{12}:Tb^{3+} and red Al_3GdB_4O_{12}:Eu_{3+}$ phosphors were synthesized and then characterized their optical properties for PDP application. And also the photoluminescence properties of these phosphors were compared with the commercial green $Zn_2SiO_4:Mn^{2+} and (Y,Gd)BO_3: Eu^{3+}$ red PDP phosphors. The phosphors were synthesized by solid state reaction at 115$0^{\circ}C$ for 4hr. It was found that the emitting brightness of $Al_3GdB_4O_{12}:Tb^{3+}$(15mol%) green phosphor under 147nm excitation was higher than that of commercial $Zn_2SiO_4: Mn^{2+}$ green PDP phosphor. However, the color coordinate of this new green phosphor was inferior to the commercial one. On the other hand, the emitting intensity of $Al_3GdB_4O_{12}:Eu^{3+}$(15mol%) red phosphor was smaller than the $commercial(Y,Gd)BO_3: Eu^{3+}$ red one, but the CIE coordinate was slightly improved. The excitation spectrum showed that $Al_3GdB_4O_{12}$ phosphors had a strong excitation band at $\lambda=160nm$ associated with the host absorption. And the photoluminance excitation (PLE) intensity in VUV range for $Al_3GdB_4O_{12}:Tb^{3+}$ green phosphor was higher than that of $Zn_2SiO_4: Mn^{2+}$, but the PLE intensity of $Al_3GdB_4O_{12}:Eu^{3+}$ red phosphor was smaller than $(Y,Gd)BO_3: Eu^{3+}$.
PDP용의 새로운 녹색 $Al_3GdB_4O_{12}:Tb^{3+} 형광체와 Al_3GdB_4O_{12}:Eu_{3+}$ 적색형광체를 제조한 후 광특성을 분석하였다. 또한 이들 형광체의 발광특성을 상용품인 $Zn_2SiO_4:Mn^{2+}$ 녹색 형광체와 $(Y,Gd)BO_3: Eu^{3+}$ 적색의 PDP 형광체와 상호 비교하였다. 형광체는 $1150^{\circ}C$에서 4시간 동안 공상 반응으로 제조하였다. 147nm의 진공자외선 조사시 $Al_3GdB_4O_{12}:Tb^{3+}$(15mol%) 녹색 형광체의 발광휘도는 상용품 $Zn_2SiO_4: Mn^{2+}$ 보다 증가하였으나 색좌표는 상대적으로 저하되었다. 한편 $Al_3GdB_4O_{12}:Eu^{3+}$(15mol%) 적색 형광체의 발광 휘도는 상용품$(Y,Gd)BO_3: Eu^{3+}$ 보다 작았으나 CIE 색좌표는 일부 개선되었다. $Al_3GdB_4O_{12}$ 형광체는 $\lambda=160nm$에서 모체 흡수에 의한 강한 여기밴드가 있으며, 진공자외선 영역에서 $Al_3GdB_4O_{12}:Tb^{3+}$ 녹색형광체의 여기강도는 $Zn_2SiO_4: Mn^{2+}$ 보다 컸으나 $Al_3GdB_4O_{12}:Eu^{3+}$ 적색 형광체의 여기강도는 $(Y,Gd)BO_3: Eu^{3+}$ 보다는 작았다.