红橙蓝发光Ce/Mn:Cd0.5Zn0.5B4O7材料和体系多重能量传递

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

摘要:

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、0.8658 nm, 属于正交晶系, Pbca空间群。Ce/Mn:Cd0.5Zn0.5B4O7 的光谱显示：由285、370、296 nm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630 nm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。

Abstract:

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