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白光LED用新型紅色熒光粉SrMgSi2O6:Eu3+, M(M=Gd3+, Ti4+)的合成及性質(zhì)
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國(guó)家自然科學(xué)基金資助項(xiàng)目(20675023); 河北省教育廳博士基金資助項(xiàng)目(B2004205)


Preparation of New Red Emitting Phosphor SrMgSi2O6:Eu3+,M (M=Gd3+, Ti4+) for White LEDs and Its Properties
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    摘要:

    以Na2CO3為電荷補(bǔ)償劑，采用凝膠-燃燒法合成新型紅色硅酸鹽發(fā)光材料SrMgSi2O6:Eu3+。用X射線粉末衍射儀、熒光分光光度計(jì)等對(duì)合成產(chǎn)物進(jìn)行分析和表征。結(jié)果表明：SrMgSi2O6:Eu3+ 的晶體結(jié)構(gòu)與Sr2MgSi2O7相同，同屬四方晶系。樣品SrMgSi2O6:Eu3+的激發(fā)光譜在220～300 nm出現(xiàn)一寬帶吸收，歸屬于O2--Eu3+之間的電荷遷移，300 nm以后出現(xiàn)的銳線峰為Eu3+的f-f躍遷吸收峰，其最強(qiáng)銳線峰位于400 nm，因而，可以被InGaN管芯產(chǎn)生的紫外輻射有效激發(fā)。發(fā)射光譜由兩個(gè)強(qiáng)發(fā)射峰組成，位于592和618 nm處，分別屬于典型的Eu3+的5D0→7F1和5D0→7F2躍遷。此外，研究發(fā)現(xiàn)：共摻Gd3+或Ti4+均能敏化Eu3+的發(fā)光，可有效提高樣品的紅光發(fā)射。因此，SrMgSi2O6:Eu3+, M(M=Gd3+, Ti4+)有望成為一種與InGaN管芯匹配的白光LED用紅色熒光粉

    Abstract:

    Novel red phosphors SrMgSi2O6:Eu3+ were synthesized by a gel-combustion method, with Na2CO3 as the charge compensation agent. The as-synthesized phosphors were analyzed and characterized by XRD and fluorescence spectrophotometer. The results show that the SrMgSi2O6:Eu3+ phosphor possesses a tetragonal crystal structure which is similar to that of Sr2MgSi2O7. The excitation spectrum of the SrMgSi2O6:Eu3+ sample presents wide band absorption between 220 and 300 nm, which is ascribed to the charge transfer between Eu3+ and O2-. The sharp peaks appearing after 300 nm belong to f-f transition of Eu3+, and the strongest sharp peak is located at 400 nm. Therefore, samples can be efficiently excited by ultraviolet radiation from InGaN chip. The emission spectrum consists of two strong emission peaks at 592 nm and 618 nm, which are ascribed to 5D0→7F1 and 5D0→7F2 respectively. Moreover, it is found that co-doped Gd3+ or Ti4+ can sensitize the luminescence of Eu3+ in SrMgSi2O6:Eu3+, in other words, co-doped Gd3+ or Ti4+ can improve red light emission of samples efficiently. So SrMgSi2O6:Eu3+, M(M=Gd3+, Ti4+) shows good prospect for red phosphors of white LED

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翟永清,馮仕華,張 張,石領(lǐng)娟,郝曉紅.白光LED用新型紅色熒光粉SrMgSi2O6:Eu3+, M(M=Gd3+, Ti4+)的合成及性質(zhì)[J].稀有金屬材料與工程,2010,39(10):1825~1828.[Zhai Yongqing, Feng Shihua, Zhang Zhang, Shi Lingjuan, Hao Xiaohong. Preparation of New Red Emitting Phosphor SrMgSi2O6:Eu3+,M (M=Gd3+, Ti4+) for White LEDs and Its Properties[J]. Rare Metal Materials and Engineering,2010,39(10):1825~1828.]
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  • 收稿日期:2009-09-10
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