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标题：The application of green YPO4:Ce 3 ,Tb3 and red LiLaO2:Eu3 layers to remote phosphor LED
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作者：My Hanh Nguyen Thi ; Nguyen Thi Phuong Loan ; Nguyễn Đoàn Quốc Anh 等
期刊名称：TELKOMNIKA (Telecommunication Computing Electronics and Control)
印刷版ISSN：2302-9293
出版年度：2020
卷号：18
期号：6
页码：3216-3221
DOI：10.12928/telkomnika.v18i6.13647
出版社：Universitas Ahmad Dahlan
摘要：Remote phosphor structure is commonly limited in color quality, but has greater luminous flux when comparing to structures with in-cup or conformal coating. From this dilemma, various researches with advance modifications have been proposed to perfect the chromatic performance of remote structure. In this research, we reach higher color quality by obtaining better values in quality indcators such as color rendering index (CRI) and color quality scale (CQS) with the dual-layer phosphor in our remote white light-emitting diodes (WLEDs). The idea is to ultize WLEDs with 7000 K correlated color temperature (CCT) and create dual-layer configuration with yellow phosphor YAG:Ce3 under green phosphor YPO4:Ce3 ,Tb3 or red phosphor LiLaO2:Eu3 . After that, we search for suitable concentration of LiLaO2:Eu3 for addition in order to acquire the finest color quality. The result shows that WLED with LiLaO2:Eu3 has better CRI and CQS as the higher the concentration of LiLaO2:Eu3 , the larger CRI and CQS due to increased light scattered in WLEDs. Meanwhile, the green phosphor layer YPO4:Ce3 ,Tb3 give advantages to luminous flux. However, the reduction in luminous flux and color quality occurs when the concentration of LiLaO2:Eu3 and YPO4:Ce3 ,Tb3 over increase. Results are verified by Mie theory and Beer’s Law and can be applied to practical manufacturing of high quality WLEDs.
关键词：color rendering index; LiLaO2:Eu3 ; lumen output; Mie-scattering theory; WLEDs; YPO4:Ce3 ; Tb3 ;