진공자외선 여기에 의한 YAGG:Ce3+ 형광체의 광발광 특성에 미치는 Al2O3 나노입자 원료의 결정상의 영향

우미혜; 최성호; 정하균; Mihye Wu; Sungho Choi; Ha-Kyun Jung

Korean Journal of Materials Research, Vol.22, No.4, 195-201, April, 2012

DOI10.3740/MRSK.2012.22.4.195 Export Citation

진공자외선 여기에 의한 YAGG:Ce3+ 형광체의 광발광 특성에 미치는 Al2O3 나노입자 원료의 결정상의 영향

Effect of the Crystalline Phase of Al2O3 Nanoparticle on the Luminescence Properties of YAGG:Ce3+ Phosphor under Vacuum UV Excitation

우미혜, 최성호, 정하균^†

한국화학연구원 에너지소재연구센터

Mihye Wu, Sungho Choi, and Ha-Kyun Jung^†

Advanced Materials Division, Korea Research Institute of Chemical Technology, Yuseong, Daejeon 305-600, Korea

E-mail:

Ce3+-doped yttrium aluminum gallium garnet (YAGG:Ce3+), which is a green-emitting phosphor, was synthesized by solid state reaction using α-phase or γ-phase of nano-sized Al2O3 as the Al source. The processing conditions and the chemical composition of phosphor for the maximum emission intensity were optimized on the basis of emission intensity undervacuum UV excitation. The opti mum heating temperature for phosphor preparation was 1550oC. Photoluminescence properties of the synthesized phosphor were investigated in detail. From the excitation and emission spectra, it was confirmed that the YAGG:Ce3+ phosphors effectively absorb the vacuum UV of 120-200 nm and emit green light positioned around 530 nm. The crystalline phase of the alumina nanoparticles affected the particle size and the luminescence property of the synthesized phosphors. Nano-sized γ-Al2O3 was more effective for the achievement of higher emission intensity than was nano-sized α- Al2O3. This discrepancy is considered to be because the diffusion of Al3+ into Y2O3 lattice is dependent on the crystalline phase of Al2O3, which affects the phase transformation of YAGG:Ce3+ phosphors. The optimum chemical composition, having the maximum emission intensity, was (Y2.98Ce0.02)(Al2.8Ga1.8)O11.4 prepared with γ-Al2O3. On the other hand, the decay time of the YAGG:Ce3+ phosphors, irrespective of the crystalline phase of the nano-sized alumina source, was below 1 ms due to the allowed 5d→ 4f transition of the Ce3+ activator.

Keywords:YAGG:Ce3+;green phosphor;α-alumina;γ-alumina

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[2] Seo JH, Choi S, Nahm S, Jung HK, Korean J. Mater. Res., 22(2), 103 (2012)

[3] Wu CC, Cheng BM, Chen TM, J. Rare Earth., 24, 179 (2006)

[4] Han BY, Yoo JS, Yoo YG, Heo EG, J. Electrochem. Soc., 156(12), J382 (2009)

[5] Lee SH, Jung DS, Han JM, Koo HY, Kang YC, J. Alloy. Comp., 477, 776 (2009)

[6] Haranath D, Chander H, Sharma P, Singh S, Appl. Phys. Lett., 89, 173118 (2006)

[7] Pan Y, Wu M, Su Q, J. Phys. Chem. Solid., 65, 845 (2004)

[8] Medraj M, Hammond R, Parvez MA, Drew RAL, Thompson WT, J. Eur. Ceram. Soc., 26, 3515 (2006)

[9] Yang H, Yuan L, Zhu G, Yu A, Xu H, Mater. Lett., 63, 2271 (2009)

[10] Ohno K, Abe T, J. Electrochem. Soc., 141(5), 1252 (1994)

[11] Yang HS, Lee DK, Kim YS, Mater. Chem. Phys., 114(2-3), 665 (2009)

[12] Huh YD, Cho YS, Do YR, Bull. Korean Chem. Soc., 23(10), 1435 (2002)

[13] Won CW, Nersisyan HH, Won HI, Lee JH, Lee KH, J. Alloy. Comp., 509, 2621 (2011)

[14] Tasi MS, Fu WC, Wu WC, Chen CH, Yang CH, J. Alloy. Comp., 455(1-2), 461 (2008)

[15] Li G, Cao Q, Li Z, Huang Y, Wei Y, Shi J, J. Alloy. Comp., 485, 561 (2009)

[16] Babin V, Kink M, Maksimov Y, Nejezchleb K, Nikl M, Zazubovich S, J. Lumin., 122-123, 332 (2007)