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alibabashiqun铁杆木虫 (知名作家)
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[求助]
急求改写英文一段话。。。
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| 在保证意思不改变条件下，因下文有些句式是从文献摘抄下来的，因此急需改写下述一段话：During the past few years, white LEDs as a burgeoning pollution–free lighting source for general illumination have attracted much attention due to these reasons, such as good reliability, lower energy consumption, high efficiency and long lifetime.1-3 Up to now, the main strategy for producing white LEDs is to combine blue or near–UV LED chips with phosphors.4-5 Currently, there are mainly two approaches to produce white light. One approach achieved white light which has become a commercial production in large–scale is to combine a yellow phosphor of Y3Al5O12: Ce3+ (YAG: Ce3+) to be deficient in the red region, resulting in a lowly color rendering index (CRI) due to lack of red component limits the applicability for this type of LED. 6-7 In order to improve the white light quality, the other approach to obtain white light is proposed to combine near ultraviolet (NUV) LED chip with multiphase (red, green and blue) phosphors, which possesses high color rendering index and superior color uniformity due to white color generated only by phoshors.8 However, the lack of broad and strong excitation bands in the NUV or blue region makes them of little use in phosphor–converted LEDs.9 Therefore, it is highly desirable to develop a new red or reddish orange emitting phosphors. Eu3+ ion is an essential activator for many different inorganic lattices to produce orange–red emission because of its 5Di→7Fj (i = 0–4; j = 0–2) transitions. The white LEDs employing NUV LED chips with tri–color phosphors have the advantage of less color point–shift against current as the white light is only phosphor converted rather than the case of combining blue LED chips with phosphors (e.g. YAG: Ce3+). Therefore, it is necessary to develop new phosphors that are excitable by NUV light.Phosphate hosts activated with Eu3+ are well known good candidates as LED phosphors due to their low synthesis temperature and high luminescence efficiency, such as Sr5(PO4)3Cl: Eu3+,11 K3Eu(PO4)2,12 Ca10Na(PO4)7: Eu3+,13 and Ca2RF4PO4: Eu3+ (R = Gd, Y)14 red phosphors have been developed and improved. Among the phosphate, the crystal structure of XXX was first reported by XX et al.15 However, to the best of our knowledge, there is no report devote to the photoluminescence property of Eu3+ ion activated XXX phosphors in the literature until now. |
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2楼2014-04-04 17:14:53
mac194
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alibabashiqun: 金币+280, 翻译EPI+1, ★★★★★最佳答案 2014-04-05 07:55:26
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[ 感谢奖赏 ] Recent popularity of white LEDs as a durable, pollution-free light source has led to copious research on ways of ramping up production Up to now, the main strategy for producing white LEDs has been to combine blue or Near–Ultra Violet LED chips with phosphors - either a yellow phosphor of Y3Al5O12 dubbed (YAG: Ce3+) or a multi-phase (Red-Green-Blue) phosphor (YAG: Ce3+) photoluminescence lacks red light and has a a low Color Rendering Index (CRI) RGB phosphors produce highly uniform white light but lack blue light and do not respond well to NUV exposure Instead of improving the status quo, this paper focuses on a best-of-both-worlds candidate - red-emitting phosphors activated by Eu3+ ions Phosphate hosts like Sr5(PO4)3Cl: Eu3+,11 K3Eu(PO4)2,12 Ca10Na(PO4)7: Eu3+, and red-emitting Ca2RF4PO4: Eu3+ (R = Gd, Y) all have high luminescence efficiency, and can all be made at low temperatures. Since the crystal structure of XXX was first reported [XX et al], a comprehensive survey of Eu3+ activated, red-emitting phosphor has not yet emerged - until now. 附注: - "ramping up production" = 大量增产 // "red-emitting" = emitting red light - "lack of broad and strong excitation bands in the NUV" = "not excitable by NUV" 或 "do not respond well to NUV exposure" - 以下原文,适合做论文结论[我认为]不必在摘要中出现 essential activator for many different inorganic lattices to produce orange–red emission because of its 5Di→7Fj (i = 0–4; j = 0–2) transitions employing NUV LED chips with tri–color phosphors have the advantage of less color point–shift against current as the white light is only phosphor converted rather than the case of combining blue LED chips with phosphors (e.g. YAG: Ce3+) - "best-of-both-worlds" 表示具有 RGB phosphors 的 "superior color uniformity due to white color generated only by phoshors" 优点 并避免 (YAG: Ce3+) 的 " lack of red component" 缺点 |
3楼2014-04-05 02:31:04
