화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of the Korean Industrial and Engineering Chemistry, Vol.13, No.1, 93-98, February, 2002
Export Citation
발화합성법에 의한 SrAl2O4 : Eu(+2), Dy(+3) 축광성 형광체 제조
Preparation of Long Phosphorescent Phosphor SrAl2O4 : Eu(+2), Dy(+3) by Pyrophoric Synthesis Method
양영석†, 박정식, 김병규1
  • 우석대학교 화학공학과, 전북 561-701
  • 1한국지질자원 연구원, 대전 305-350
Yeong Seok Yang†, Jeong Shik Park, and Byung Kyu Kim1
  • Department of Chemical Engineering, Woosuk University, Jeon-buk 561-701, Korea
  • 1Korea Institute of Geology, Mining & Materials, Daejeon 305-350, Korea
E-mail:
초록
발화합성법으로 SrAl2O4 : Eu(+2), Dy(+3) 축광성 형광체를 제조하여 발광특성과 축광특성을 조사하였다. 형광체 제조를 위한 전구체가 발화합성으로 얻은 나노크기의 미세분말이기 때문에 모체물질인 SrAl2O4의 단일상이 비교적 낮은 온도에서 형성되었으며, 공부활제의 사용여부와 상관없이 SrAl2O4 : Eu(+2), Dy(+3)과 SrAl2O4 : Eu(+2)의 발광중심은 Eu(+2)로 동일하였다. 형광체 결정구조에서 공부활제인 Dy(+3)가 모체의 결정구조에 미치는 영향은 미미하였다. 잔광의 강도와 잔광지속시간은 모체의 구성원소인 Sr과 Al이 부족한 조성의 형광체와 공부활제가 상대적으로 많이 포함된 형광체에서 크게 나타났다. SrAl2O4 : Eu(+2), Dy(+3) 축광성형광체의 잔광특성은 공부활제인 Dy(+3)이온의 영향이 크게 미치고 있음을 확인할 수 있었으나 공부활제가 상대적으로 많은 경우에 Dy3Al5O12와 같은 불순물의 생성으로 잔광시간이 감소하였다.
Long phosphorescent phosphors with various compositions, SrAl2O4 : Eu(+2), Dy(+3) were prepared, and their emission and after-glow characteristics were investigated. Since precursors for preparing the phosphors obtained by a pyrophoric synthesis method were nano-sized fine particles, the single crystalline as phosphor host was formed at relatively low temperature, 850 ℃, and it was not dependent upon the existence of coactivator. The luminescence center of SrAl2O4 : Eu(+2), Dy(+3) and SrAl2O4:Eu(+2) was mainly due to Eu(+2). Also, the effect of coactivator, Dy(+3), on the crystal structure of phosphor host, SrAl2O4, was negligible. The brightness and long after-glow of phosphors were seen in the crystals grown from Sr-poor, Al-poor, and heavily coactivator, Dy(+3), doped starting materials. It was identified that long after-glow characteristics of SrAl2O4 : Eu(+2), Dy(+3) were affected by the coactivator; in the case where coactivator was heavily doped, the long after-glow characteristics diminished due to formation of impurities such as Dy3Al5O12 during the heat treatment.
Keywords:phosphor;afterglow;pyrophoric synthesis;nano particle;coactivator
  1. Chakhovskoi AG, Kesling WD, Trujillo JT, Hunt CE, J. Vac. Sci. Technol. B, 12(2), 785 (1994) 
  2. Shea LE, Datta RK, Brown JJ, J. Electrochem. Soc., 141(8), 2198 (1994) 
  3. Ravichandran D, Roy R, White WB, Erdei S, J. Mater. Res., 12(3), 819 (1997)
  4. Kutty TRN, Jagannathan R, Rao RP, Mater. Res. Bull., 25, 1355 (1990) 
  5. Ravichandran D, Roy R, Ravindranathan P, White WB, J. Am. Ceram. Soc., 82(4), 1082 (1999)
  6. Bhattacharya D, Pathk LC, Mishra SK, Sen D, Chopra KL, Appl. Phys. Lett., 57(20), 2145 (1990) 
  7. Yu YT, Kim BG, Nam CW, Korean J. Mater. Res., 8(11), 999 (1998)
  8. Blasse G, Bril A, Philips Res. Repts., 23, 201 (1968)
  9. Lee YK, Kim JY, Kim BG, Yu YT, Korean J. Mater. Res., 8(8), 737 (1998)
  10. Matsuzawa T, Aoki Y, Takeuchi N, Murayama Y, J. Electrochem. Soc., 143(8), 2670 (1996) 
  11. Takasaki H, Tanabe S, Hanada T, J. Ceram. Soc., 104, 322 (1996)
  12. Katsumata T, Nabae T, Sasajima K, Komuro S, Morikawa T, J. Electrochem. Soc., 144(9), L243 (1997)