Mechanical Alloying에 의해 합성된 Y2O3-H3BO3:Eu3+분말의 발광 특성

Abstract

The formation and photoluminescence(PL) properties of the Eu3+-doped Y2O3 and H3BO3 mixture using mechanical alloying(MA) method were investigated by X-ray diffractometry (XRD), scanning electron microscopy (SEM), thermogravimetric/differential thermal analysis (TG/DTA), and luminescence spectrophotometer. After milling for 300 min, significant decreases in the relative intensities of the peaks can be observed. The internal strain and crystallite size calculated using Williamson-Hall method were 0.00141 and 58.8 nm respectively for the 30 min milled mixture, and the crystallite size calculated using Scherrer method decreased with increasing milling time(tm). The entire milling precess could be divided into three different stages: agglomeration (0The transition temperature and the weight reduction rate measured by the TG/DTA were 645.58℃ and 2.851%, respectively. The strongest intensity of Eu3+ doped mixture was measured by doping the 8 mol% of Eu3+, annealing of 800℃ for 1h and milling for 300 min. Under 240 nm excitation, all of spectra consist of sharp peaks centering at the similar wavelengths : 592 ㎚(5Do→ 7F1), 613 ㎚, 628 ㎚(5Do→ 7F2) and 650 ㎚(5Do→ 7F3). The 592 ㎚ emission corresponds to the orange color, while 613 ㎚, 625 ㎚ emissions correspond to the red color.