CAJ | 학술논문

采用自蔓延燃烧法制备了不同Nd3+掺杂浓度的具有笼状结构的12CaO·7Al2O3(C12A7:x%Nd3+)粉体材料. 在808 nm波长的激发下,观测到了位于887,1 069,1 340 nm附近的3个近红外发射峰,分别归属于Nd3+的4F3/2→4IJ/2(J=9,11,13)跃迁. Nd3+掺杂摩尔分数达到0. 5%时,红外光发射较强,且没有观察到杂质相. 在H2 气氛下对样品进行1 300 ℃热处理之后,笼中OH-和H-浓度增加,笼子发生畸变,晶粒尺寸变大,样品的结晶性变好. 通过在空气下热处理,减少了高能振动基团OH-的数目,进一步增强了近红外光发射. 变温光致发光谱测量结果表明,C12A7:x%Nd3+样品具有较高的热激活能,在红外激光器上有潜在的应用前景.
채용자만연연소법제비료불동Nd3+참잡농도적구유롱상결구적12CaO·7Al2O3(C12A7:x%Nd3+)분체재료. 재808 nm파장적격발하,관측도료위우887,1 069,1 340 nm부근적3개근홍외발사봉,분별귀속우Nd3+적4F3/2→4IJ/2(J=9,11,13)약천. Nd3+참잡마이분수체도0. 5%시,홍외광발사교강,차몰유관찰도잡질상. 재H2 기분하대양품진행1 300 ℃열처리지후,롱중OH-화H-농도증가,롱자발생기변,정립척촌변대,양품적결정성변호. 통과재공기하열처리,감소료고능진동기단OH-적수목,진일보증강료근홍외광발사. 변온광치발광보측량결과표명,C12A7:x%Nd3+양품구유교고적열격활능,재홍외격광기상유잠재적응용전경.
C12A7:x%Nd3+ powders with unique nanocaged structure were synthesized by self-prop-agating combustion method. Upon 808 nm excitation, we can observe three peaks at 887, 1 069, 1 340 nm attributed to the transition 4F3/2→4IJ/2 (J =9, 11, 13) of Nd3+, respectively. When Nd3+ mole fraction is 0. 5%, the intense infrared luminescence can be obtained and no impurity phase is observed. After the annealing in H2 ambient, the encaged OH- and H- concentrations and the grain size of C12A7 increase and the cages are distorted. The improvement of the crystallinity and the decrease of the non-radiative transition rate can enhance the near-infrared luminescence after the annealing in air. Based on the temperature-dependent emission spectra, the high thermal activa-tion energies are obtained, indicating that C12A7:x%Nd3+ have potential applications in infrared laser.