Hybrid 2D photonic crystal-assisted Lu3Al5O12:Ce ceramic-plate phosphor and free-standing red film phosphor for white LEDs with high color-rendering index.
Hybrid 2D photonic crystal-assisted Lu3Al5O12:Ce ceramic-plate phosphor and free-standing red film phosphor for white LEDs with high color-rendering index.
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DOI：
10.1021/am507237n
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发表时间：
2015-02
影响因子：
9.5
通讯作者：
H. Park;J. Oh;Heejoon Kang;Jian Zhang;Y. Do
中科院分区：
文献类型：
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作者：
H. Park;J. Oh;Heejoon Kang;Jian Zhang;Y. Do
本文报道了二维（2D）SiNx光子晶体层（PCL）辅助的Lu 3Al 5 O 12：Ce（LuAG：Ce）绿色陶瓷板磷光体（CPP）和独立的（Sr，Ca）AlSiN 3：Eu红色膜磷光体的组合光学效应，以增强LuAG：Ce CPP覆盖的白色发光二极管（LED）的发光效率、显色指数（CRI）和特殊CRI（R9），用于350 mA下的高功率白色LED。通过引入2D SiNx PCL，与传统的平面CPP封端LED和厚度增加的CPP封端LED（厚度为0.15 mm）相比，发光效率分别提高了1.25倍和1.15倍，同时保持了低显色性。在平面CPP封端、2D PCL辅助CPP封端和厚度增加的CPP封端LED中组合独立的红色膜磷光体导致CRI和特殊CRI（R9）的增强;由于通过添加红色发射的宽波长覆盖，它还导致相关色温（CCT）的降低。高CRI（94）、自然白色CCT（4450 K）和可接受的发光效率（71.1 lm/W）由使用7.5重量%的红色磷光体浓度的2D PCL辅助的LuAG：Ce CPP/独立红色膜磷光体基LED获得。预期2D PCL和独立红色膜磷光体的组合将是用于实现具有优异CRI的高功率白色CPP封端LED的良好候选。
This paper reports the combined optical effects of a two-dimensional (2D) SiNx photonic crystal layer (PCL)-assisted Lu3Al5O12:Ce (LuAG:Ce) green ceramic-plate phosphor (CPP) and a free-standing (Sr,Ca)AlSiN3:Eu red film phosphor to enhance luminous efficacy, color rendering index (CRI), and special CRI (R9) of LuAG:Ce CPP-capped white light-emitting diodes (LEDs) for high-power white LEDs at 350 mA. By introducing the 2D SiNx PCL, the luminous efficacy was improved by a factor of 1.25 and 1.15 compared to that of the conventional flat CPP-capped LED and the thickness-increased CPP-capped LED (with a thickness of 0.15 mm), respectively, while maintaining low color-rendering properties. The combining of the free-standing red film phosphor in the flat CPP-capped, the 2D PCL-assisted CPP-capped, and the thickness-increased CPP-capped LEDs led to enhancement of the CRI and the special CRI (R9); it also led to a decrease of the correlated color temperature (CCT) due to broad wavelength coverage via the addition of red emission. High CRI (94), natural white CCT (4450 K), and acceptable luminous efficacy (71.1 lm/W) were attained from the 2D PCL-assisted LuAG:Ce CPP/free-standing red film phosphor-based LED using a red phosphor concentration of 7.5 wt %. It is expected that the combination of the 2D PCL and the free-standing red film phosphor will be a good candidate for achieving a high-power white CPP-capped LED with excellent CRI.