红橙蓝发光Ce/Mn:Cd0.5Zn0.5B4O7材料和体系多重能量传递

用高温固相法首次制备出红橙蓝3种光发射为一体的(Cd0.38Ce0.06/Mn0.03)Zn0.5B4O7光致发光系列材料,由XRD测得(Cd0.38Ce0.06Mn0.03)Zn0.5B4O7的晶胞参数a、b、c分别为1.3959、0.8134、0.8658nm,属于正交晶系,Pbca空间群。Ce/Mn:Cd0.5Zn0.5B4O7的光谱显示:由285、370、296nm紫外光激发,分别呈现Mn2+的4T1(4G)→6A1(6S)和Ce3+的5d→2F5/2,2F7/2能级跃迁发射以及发射强度比相近的470和630nm的复合光发射。当Ce3+和Mn2+共掺杂时它们互为激活剂和敏化剂。在荧光体Ce/Mn:Cd0.5Zn0.5B4O7中存在极少见的基质、Ce3+和Mn2+的多重能传递,其中以Ce3+Mn2+的双向能量传递为主。助熔剂CaF2和KCl都能降低合成温度和增加发光强度,但对Ce3+和Mn2+发射光谱有不同影响。

Red/Orange/Blue Luminescence Material Ce/Mn:Cd0.5Zn0.5B4O7 and Multiple Energy Transfer System

A series of photoluminescence materials of red-orange-blue three lights emission,Ce/Mn:Cd0.5Zn0.5B4O7 were prepared via a high-temperature solid-state method for the first time.The crystal system,point group and cell parameters of(Cd0.38Ce0.06/Mn0.03)Zn0.5B4O7 were confirmed by X-ray diffraction.The phosphor belongs to orthorhombic crystal system with Pbca space group.Spectral characteristics of Ce/Mn:Cd0.5Zn0.5B4O7 indicate that excited by 285 nm UV,the emission mainly presents 4T1(4G)→6A1(6S) of Mn2+;excited by 370 nm UV,the emission is mainly 5d→2F5/2,2F7/2 of Ce3+;excited by 296 nm UV,it shows compound light-emitting of 470 nm and 630 nm with similar emission intensity ratio.Ce3+ and Mn2+ co-exist,and they are the activator and the sensitizer of each other.In the phosphors Ce/MnCd0.5Zn0.5B4O7 there are multiple energy transfers among the host,Ce3+ and Mn2+,which are rarely found.The major energy transfer is Ce3+Mn2+.Flux CaF2 and KCl can reduce the synthesis temperature and increase the luminous intensity,but they have different effects for Ce3+ and Mn2+ emission spectra.