材料科學(xué)與工程 材料物理與化學(xué)，外文文獻(xiàn)翻譯及原文

Preparation and luminescent properties of CaAl2O4:Eu3+,R+(R=Li, Na, K)phosphors

CaAl2O4:Eu3+,R+ (R=Li, Na, K)熒光粉的發(fā)光性能及其制備

Abstract: CaAl2O4:Eu3+, R+(R=Li+, Na+, K+) red phosphors were synthesized by solid state reaction method. X-ray diffraction (XRD) andphotoluminescence (PL) were employed to characterize their structural and luminescent properties. It was found that the optimal sinteringtemperature and sintering time were 1200 °C and 4 h, respectively. The optimal concentration of doped Eu3+was 3 mol.%. Furthermore, un-der ultraviolet excitation with a wavelength of 254 nm, these samples showed red luminescence which were probably attributed to the transi-tions from5D0excited state to7FJ(J=0–4) ground states of Eu3+ions. The feature and the high intensity of hypersensitive transition from5D0→7F2indicated that Eu3+preferred to occupy a low symmetry site. The incorporation of alkali metal ions greatly enhanced the lumines-cence intensity probably due to the influence of charge compensation of alkali metal ions

摘要：通過(guò)固相反應(yīng)法合成了CaAl2O4:Eu3+, R+ (R=Li+, Na+, K+) 紅色熒光粉。利用X射線衍射（XRD）和光致發(fā)光（PL）對(duì)其進(jìn)行了表征其結(jié)構(gòu)及發(fā)光性能的檢測(cè)。被發(fā)現(xiàn)其最佳的燒結(jié)溫度和燒結(jié)時(shí)間分別為1200°C和4 h，摻雜Eu3+的最佳濃度為3 mol.%。此外，用波長(zhǎng)為254 nm的紫外光激發(fā)下，這些樣品顯示紅色發(fā)光可能是歸因于Eu3+從 5D0激發(fā)態(tài)躍遷到7FJ (J=0–4)的基態(tài)。從其特征和 5D0→7F2 超高靈敏的躍遷表明，Eu3+優(yōu)先占據(jù)低能級(jí)態(tài)。堿金屬離子的摻入大大的增強(qiáng)了熒光粉的發(fā)光強(qiáng)度可能是由于堿金屬離子對(duì)的電荷補(bǔ)償。