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Chinese Journal of Materials Research  2016, Vol. 30 Issue (5): 388-392    DOI: 10.11901/1005.3093.2015.029
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Optical Properties of High-power White LED Based on Fluorescent Films
CHEN Feng1,2, ZHANG Mei1,**(), HE Xin1, LUO Jianyi1, ZENG Qingguang1, QING Ning2
1. School of Applied Physics and Materials, Wuyi University, Jiangmen, 529020, China
2. School of Chemical and Environment engineering, Wuyi University, Jiangmen, 529020, China
Cite this article: 

CHEN Feng, ZHANG Mei, HE Xin, LUO Jianyi, ZENG Qingguang, QING Ning. Optical Properties of High-power White LED Based on Fluorescent Films. Chinese Journal of Materials Research, 2016, 30(5): 388-392.

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Abstract  

The fluorescent films were produced by phosphors and silicones for LED packaging modules. Then the high-power white LEDs were fabricated based on these films and 455 nm Ga(In)N chip modules. The fluorescent films and the fabricated LEDs are characterized by absorption, fluorescent and electroluminescent spectra in details. It follows that the prepared films are smooth and uniform with high quality; the absorption peaks of the films based Y3Al5O12:Ce3+ (YAG) phosphors are around 337 nm and 450 nm, respectively, corresponding to the f-d transition of Ce3+ in YAG phosphors; the fluorescent films with thickness of 1.00 mm are suitable for 2.8 W LED modules; the luminous efficiency of the fabricated LEDs can reach 76 lm/W. The influence of the ratio of red phosphors to yellow phosphors on the white LEDs was also examined in order to prepare the white LED with high color rendering index. Then white LEDs with the correlated color temperature Tc of 4460K, and the color rendering index of 91.7 was also obtained.
Key words:  inorganic non-metallic materials      white light emitting diodes      packaging modules      fluorescent films     
Received:  25 January 2015     
ZTFLH:  TB321  
Fund: *Supported by National Natural Science Foundation of China No.61307026, the 14th Technical Project of Jiangmen(Jiangcaigong No.[2014]145) and the Science Foundation for Young Teachers of Wuyi University No.2013zk16
About author:  **To whom correspondence should be addressed , Tel:(0750)3296095, E-mail:zmjenny@163.com
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Feng CHEN
Mei ZHANG
Xin HE
Jianyi LUO
Qingguang ZENG
Ning QING

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https://www.cjmr.org/EN/10.11901/1005.3093.2015.029     OR     https://www.cjmr.org/EN/Y2016/V30/I5/388

Fig.1  Preparation process (a), photograph (b) and micrograph (c) of the fluorescent films
Fig.2  UV-Vis absorption spectra of the YAG fluorescent films with different thickness
Fig.3  Electroluminescence spectra of the fabricated LEDs based on blue LED modules and fluorescent films (IF = 300 mA)
Thickness(mm) Luminous
efficiency (lm/W)		 x y Tc(K) Ra
0.88 69.89 0.3034 0.359 6737 72.4
1.00 76.35 0.3277 0.4066 5660 67.7
1.14 76.96 0.3457 0.4416 5184 64.9
1.36 76.28 0.3602 0.4691 4902 62.7
1.52 77.79 0.3695 0.4864 4752 61.2
Table 1  Parameters of the fabricated LEDs based on blue LED modules and fluorescent films (IF = 300 mA)
Fig.4  Electroluminescence spectra of LEDs (a); CIE 1931 chromaticity diagram based on blue LED modules and Sr3SiO5:Eu2+ fluorescent films (IF = 300 mA) (b)
Fig.5  Electroluminescence spectra of the high rendering index LEDs (IF = 300 mA)
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