摘要
采用高温固相法合成了Er3+、Yb3+共掺杂的NaYF4荧光粉。XRD测量数据表明合成的样品为纯相。测量了样品的激发谱和发射谱,证明377 nm的紫外光通过量子剪裁的形式将能量传递给一个Yb3+,发射一个975 nm的红外光子,再从4F9/2能级跃迁到基态发射一个红外光子。测量了377 nm激发下,监测541 nm的发光寿命曲线,计算得到最大的量子效率为126.35%。通过监测Yb3+的975 nm的近红外发射,证明了Er3+的4F7/2和2H11/2能级通过下转换的形式将吸收的485 nm和519 nm的能量传递给Yb3+。这种将Er3+在可见光波段的多种光子能量传递给Yb3+发射975 nm的近红外光子的思想在以前的研究中从未被提出。
Er3 +,Yb3 +doped NaYF4 phosphors were prepared by high-temperature solid state method. Structures of the samples were investigated by X-ray diffraction. The excitation and emission spectra of the phosphors were measured. The 377 nm photon jumped from4G11 /2to4F9 /2,and the energy was transferred to2F5 /2energy level of Yb3 +. A 975 nm near-infrared photon was thus obtained. Then,the photon in4F9 /2jumped to the ground state and emitted a 670 nm red photon. Furthermore,the luminescence decay curves of 541 nm emission excited by 377 nm were measured,and the quantum efficiencies were calculated. The maximum quantum efficiency was 126. 35%. By monitoring the 975 nm emission,the energy transfer from4F7 /2( 485 nm) and2H11 /2( 519 nm) of Er3 +to Yb3 +also occurred by down-conversion. This research has not been done before.
出处
《发光学报》
EI
CAS
CSCD
北大核心
2014年第9期1058-1064,共7页
Chinese Journal of Luminescence
基金
国家自然科学基金(50902042)
中国博士后科学基金(20100480840)
河北省自然科学基金(E2010000283)资助项目
关键词
下转换
量子剪裁
寿命
量子效率
太阳能电池
down-conversion
quantum cutting
lifetime
quantum efficiency
solar cells
