WO2011109977A1 - 脉冲电流驱动的白光led照明装置 - Google Patents

脉冲电流驱动的白光led照明装置 Download PDF

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Publication number
WO2011109977A1
WO2011109977A1 PCT/CN2010/075145 CN2010075145W WO2011109977A1 WO 2011109977 A1 WO2011109977 A1 WO 2011109977A1 CN 2010075145 W CN2010075145 W CN 2010075145W WO 2011109977 A1 WO2011109977 A1 WO 2011109977A1
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Prior art keywords
luminescent material
pulse current
blue
white led
afterglow
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PCT/CN2010/075145
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English (en)
French (fr)
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张明
赵昆
李东明
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四川新力光源有限公司
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Priority to BR112012022902A priority Critical patent/BR112012022902A2/pt
Priority to KR1020127023835A priority patent/KR101387555B1/ko
Priority to ES10847235.8T priority patent/ES2607057T3/es
Priority to AU2010348290A priority patent/AU2010348290B2/en
Priority to CN201080065364.8A priority patent/CN102792472B/zh
Priority to JP2012557373A priority patent/JP5833583B2/ja
Priority to US13/583,464 priority patent/US8637874B2/en
Priority to CA2792189A priority patent/CA2792189C/en
Application filed by 四川新力光源有限公司 filed Critical 四川新力光源有限公司
Priority to RU2012142234/04A priority patent/RU2522461C2/ru
Priority to SG2012066510A priority patent/SG183965A1/en
Priority to EP10847235.8A priority patent/EP2546896B1/en
Publication of WO2011109977A1 publication Critical patent/WO2011109977A1/zh
Priority to ZA2012/06538A priority patent/ZA201206538B/en
Priority to HK13101757.6A priority patent/HK1174740A1/zh
Priority to US14/107,294 priority patent/US8878199B2/en
Priority to US14/107,387 priority patent/US8877527B2/en
Priority to US14/107,346 priority patent/US8883525B2/en

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    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
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    • H—ELECTRICITY
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    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
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Definitions

  • LED is used in the fields of illumination, display and backlight, and has attracted extensive attention as the most promising next-generation lighting method due to its energy saving, durability and pollution-free.
  • white LEDs blue LED chips and yellow phosphors are used to realize white light emission. It is the most mature technical solution for preparing white LEDs.
  • Appl. Phys. Lett., Vol. 11, p. 53 reports the luminescent material Y 3 A1 5 0 12 : Ce 3+ , which has yellow luminescence, the strongest emission wavelength is 550 nm, and the lifetime is less than 100 nanoseconds. . 1997, Appl. Phys. A, No.
  • a new white LED lighting device consisting of a blue LED chip with a blue afterglow luminescent material A+ yellow luminescent material B.
  • the weight ratio of the blue afterglow material A to the yellow luminescent material B is 10 - 70 wt%: 30_90 wt%.
  • 20-50% by weight 50-80% by weight.
  • the white LED lighting device uses a pulse current to drive the LED chip, and the frequency of the pulse current is not less than 50 Hz.
  • the blue afterglow luminescent material A has a peak wavelength of 440-490 nm, such as: Sr 4 Al 14 0 25 :Eu 2+ , Dy 3+ , Sr 2 MgSi 2 0 7 :Eu 2+ , Dy 3 + , CaS: Bi 3+ , Na + CaS: Cu + , Na + , CaSrS: Bi 3+ . It may be a combination of one or more blue afterglow luminescent materials.
  • Table 2 shows that the LED chips given in Embodiments 1-18 are directly connected to the AC mains, as shown in the module of FIG.
  • the illuminating device measures the illuminance within 20 milliseconds of a high speed camera that takes 300 photos per second.
  • the reference sample is a pulsed current driving LED illumination device composed of a white LED chip of a yellow luminescent material on a commercially available blue chip package.
  • the brightness data in Table 2 is the measurement of the instrument. Table 2
  • Test Example 2 Light fading of the LED illuminating device of the present invention
  • the data of Table 2-3 shows that the pulse current-driven white LED illumination device prepared by using the luminescent material with afterglow characteristics has the advantages of stable illumination and small light decay, and has obvious novelty compared with the existing LED illumination device. And creativity.

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Description

脉冲电流驱动的白光 LED照明装置
技术领域
本发明涉及一种使用发光粉余辉特性及脉冲电流驱动的白光 LED照明装置， 属于 LED制 造领域。 更具体的说， 涉及一种使用蓝色余辉发光材料和黄色发光材料制备的脉冲电流驱动 的白光 LED照明装置。
背景技术
目前， LED 用于照明、 显示和背光源等领域， 并以其节能、 耐用、 无污染等优点作为最 有希望的下一代照明方式而引起广泛的重视。 实现白光 LED 有多种方案，其中采用蓝光 LED 芯片和黄色荧光粉组合来实现白光发射，是当前制备白光 LED最为成熟的技术方案。 1967年 《Appl. Phys. Lett.》 第 11卷第 53页报道了发光材料 Y3A15012 : Ce3+, 该材料具有黄色发光， 最强发光波长在 550纳米， 寿命小于 100纳秒。 1997年 《Appl. Phys. A》第 64期 417页报道 了利用 Y3A15012 : Ce3+的黄色发光和蓝光氮化镓实现了 LED白光发射，此技术是当前制备白光 LED 最为成熟的技术方案。 现有 LED大部分采用大小及方向恒定的直流电做为芯片的驱动装置， 在这种方式下， 对 LED的散热设计要求很高， 如果不能及时将多余的热量散去， LED芯片会 因结温过高而烧毁。
CN100464111C公布了一种利用不同发光颜色的 LED芯片并联在交流电源中的交流 LED灯， 主要描述不同颜色的 LED芯片在一起构成白光， 及其具体电路， 如红、 绿和蓝色发光芯片， 而没有涉及发光粉。 美国专利 US 7， 489， 086， B2公布了一种交流 LED驱动装置及使用它的照 明器件该专利也着重于电路的组成， 而对发光粉未见创新报道，仍然是使用传统 Y3A15012 : Ce3+ 发光粉。 本发明的发明人研究了一种具有黄色长余辉现象的 Y203*Al2(VSi02 : Ce*B*Na*P发光材 料及使用脉冲电流驱动的白光 LED照明装置 （中国专利申请 200910307357. 3)。 但采用本发 明的脉冲电流驱动方式和发光粉的余辉特性来弥补光输出波动的白光 LED 照明装置未见报 道。
发明内容
本发明的目的是提供一种脉冲电流驱动的白光 LED照明装置。
本发明的技术方案： 脉冲电流驱动的蓝光 LED芯片或紫外芯片 +蓝色余辉发光材料 A+黄 色发光材料 B。 其中， 蓝色余辉发光材料 A 与黄色发光材料 B 的重量配比为 10 - 70wt% : 30~90wt%。优选的是： 20~50wt%: 50~80wt%o所述的白光 LED照明装置使用脉冲电流驱动 LED 芯片， 脉冲电流的频率不小于 50赫兹。 本发明实现了一种使用脉冲电流驱动的白光 LED照明装置， 使 LED芯片周期性的间歇工 作， 同时由于本发明所使用的发光粉具有余辉效应， 能够弥补由于脉冲电流周期性变化导致 的照明装置的光输出波动。
进一步地， 所述蓝色余辉发光材料 A的发光波长峰值在 440-490纳米之间。
进一步地， 所述蓝色余辉发光材料 A 为 Sr4Al14025:Eu2+,Dy3+、 Sr2MgSi207:Eu2+,Dy3+、
CaS:Bi3+,Na+ CaS:Cu+,Na+或 CaSrS:Bi3+中的至少一种。
所述黄色发光材料 B的发光波长峰值在 520— 580纳米之间。
进一步地， 黄色发光材料 B是具有余辉现象的发光材料、 不具有余辉的黄色发光材料， 或二者混合。
进一步地， 黄色发光材料 B是： Y203*Al203*Si02 : Ce*B*Na*P、 Y202S : Mg，Ti、 Sr3Si05 : Eu2+,
Dy3+、 C¾MgSi207 : Eu2+，Dy3+、 CaS:Sm3+、 YAG : Ce或 TAG: Ce中的至少一种。
本发明白光 LED照明装置的白光发射来自于在蓝光 LED芯片或紫外芯片的激发下， 蓝色 余辉发光粉发射的蓝光， 黄色发光粉发射的黄光与芯片的光组合成白光。
用紫光和紫外 LED芯片也能激发上述发光粉， 产生同样的效果。 本发明发光材料涂层可以采用蓝色余辉发光材料 A+黄色发光材料 B的混合发光涂层。 也可以先将蓝色余辉发光材料 A涂在芯片上后再在蓝色余辉发光材料 A涂层上黄色发光材料 B。
本发明脉冲电流驱动的白光 LED照明装置原理如下：
通过附图 1中所示的 LED照明装置的基本模块示意图可以看出， 脉冲电流的脉冲周期特 性决定器件的发光也会具有明暗变化的周期性， 亦即发光频闪， 从而影响器件的使用。
本发明由于采用具有余辉特性的发光材料， 在激发光源消失时能维持发光， 这样， 在基 于本发明方案的脉冲电流驱动的白光 LED照明装置中， 当电流周期性变化到小电流阶段时， 蓝色余辉材料会发射蓝色余辉， 起到了弥补蓝光和激发黄色发光粉的作用， 从而克服了由于 脉冲电流波动导致的 LED芯片的发光频闪的影响， 使器件在脉冲周期的光输出保持稳定。 另 夕卜， 由于在脉冲周期内 LED芯片有一段时间不工作， 使得其热效应下降， 这样有助于克服现 有 LED白光照明装置使用中碰到的芯片发热带来的系列难题。 而且， 本发明脉冲电流驱动的 白光 LED照明装置具有散热性能好、使用寿命长的特点， 且不需要使用复杂的电路转换装置， 显著降低了成本。
说明书附图
图 1为脉冲电流驱动 LED发光基本装置示意图 图 2为 Sr4Al14025:EU 2+,Dy3+余辉光谱
图 3为 Sr2MgSl207:EU 2+,Dy3+余辉光谱
图 4为 Y2(VAl203*Si02 : Ce*B*Na*P的光致发光光谱
图 5为 LED发光单元组成示意图
图 5— 1， 1为蓝色余辉发光材料 A+黄色发光材料 B的混合发光涂层； 2为蓝光、 紫光 或紫外 LED芯片； 3为透镜。
图 5— 2， 2为蓝光、紫光或紫外 LED芯片； 3为透镜， 5为蓝色余辉发光材料 A的涂层，4 为黄色发光材料 B的涂层。
以下通过实施例形式的具体实施方式， 对本发明的上述内容再作进一步的详细说明。 但 不应将此理解为本发明上述主题的范围仅限于以下的实例， 凡基于本发明上述内容所实现的 技术均属于本发明的范围。 实施例中， 脉冲电流的频率为 100赫兹， 蓝光 LED芯片的发射波 长为 460纳米， 紫光 LED芯片的发射波长为 400nm, 紫外 LED芯片的发射波长为 365nm。 具体实施方式
一种新的白光 LED照明装置， 它是由蓝光 LED芯片十蓝色余辉发光材料 A+黄色发光材料 B组成。 其中， 蓝色余辉发光材料 A与黄色发光材料 B的重量配比为 10 - 70wt%： 30_90wt%。 优选的是： 20-50wt%: 50-80wt%。所述的白光 LED照明装置使用脉冲电流驱动 LED芯片， 脉冲 电流的频率不小于 50赫兹。
其中，蓝色余辉发光材料 A的发光波长峰值在 440-490纳米之间，如： Sr4Al14025:Eu2+,Dy3+、 Sr2MgSi207:Eu2+,Dy3+、 CaS:Bi3+,Na+ CaS:Cu+,Na+、 CaSrS:Bi3+。 可以是一种或一种以上蓝色 余辉发光材料的组合。
黄色发光材料 B可以是具有余辉现象的发光材料，也可以是不具有余辉的黄色发光材料， 或是二者混合。 其发光波长峰值在 520— 580纳米之间。 具有余辉现象的发光材料： Ce激活 的具有余辉现象的 Y203.Al203.Si02 : Ce.B.Na.P、 Y202S:Mg,Ti、 Sr3Si05:Eu2+, Dy3+、 Ca2MgSi207:Eu2+,Dy3+、 CaS:Sm3+; 不具有余辉的黄色发光材料 YAG : Ce和 TAG: Ce。
本发明白光 LED照明装置的白光发射来自于在蓝光 LED芯片激发下， 蓝色余辉发光粉发 射的蓝光， 黄色发光粉发射的黄光与芯片的光组合成白光。
本发明由于采用具有余辉特性的发光材料， 在激发光源消失时能维持发光， 这样， 在基 于本发明方案的脉冲电流驱动的白光 LED照明装置中， 当电流周期变化时， 蓝色余辉材料会 发射蓝色余辉， 起到了弥补蓝光和激发黄色发光粉的作用， 从而克服了由于脉冲电流波动导 致的 LED芯片的发光频闪对照明的影响， 使器件在脉冲周期的光输出保持稳定。 另外， 由于 在脉冲电流周期内 LED芯片有一段时间不工作， 使得其热效应下降， 这样有助于克服现有白 光 LED照明装置使用中碰到的芯片发热带来的系列难题。
以下是具体实施例。
实施例 1-18
表 1
LED 蓝色余辉发光材料 A 黄色发光材料 B
实施例
芯片 (wt%) (wt%)
1 蓝光 40%Sr4Al14025 :Eu2+, Dy+ 60%Y203*Al203*Si02:Ce*B*Na*P
2 蓝光 35%Sr2MgSi207 :Eu2+, Dy+ 65%Y3Al5012:Ce
10%Sr2MgSi207 :Eu2+, Dy+
3 蓝光 60%Tb3Al5012:Ce
+ 30%Sr4Al14025 :Eu2+, Dy+
5%Sr2MgSi207 :Eu2+, Dy+ 25%Y203*Al203*Si02:Ce*B*Na*P
4 蓝光 + 30%Sr4Al14025 :Eu2+, Dy+ +10%Sr3Si05:Eu2+, Dy +
+15%CaS:Bi +, Na+ +15%C¾MgSi207 :Eu2+, Dy +
10%Sr2MgSi207 :Eu2+, Dy+
+15%CaSrS:Bi + 5%Y202S:Mg, Ti
5 蓝光
+35%Sr4Al14025 :Eu2+, Dy+ +25%Y203*Al203*Si02:Ce*B*Na*P +5%CaS： Bi3+， Na++5%CaS： Cu+， Na+
5%Sr2MgSi207 :Eu2+, Dy+ 15%Sr3Si05:Eu2+, Dy +
6 蓝光 +15%CaSrS:Bi + +20%C¾MgSi207 :Eu2+, Dy+
+20%Sr4Al14025 :Eu2+, Dy+ +25%Y3A15012： Ce
25%Y203*Al203*Si02:Ce*B*Na*P
+10%CaS:Sm+
7 蓝光 35%CaS:Bi +, Na+ +15%Y202S:Mg, Ti
+5%Sr3Si05:Eu2+, Dy +
+10%C¾MgSi207 :Eu2+, Dy+
8 紫光 45%Sr4Al14025 :Eu2+, Dy+ 55%Y203*Al203*Si02:Ce*B*Na*P
9 紫光 40%Sr2MgSi207 :Eu2+, Dy+ 60%Y3Al5012:Ce
10%Sr2MgSi207 :Eu2+, Dy+
10 紫光 55%Tb3Al5012:Ce
+ 35%Sr4Al14025 :Eu2+, Dy+ 5%Sr2MgSi207 :Eu2+, Dy+ 25%Y203*Al203*Si02:Ce*B*Na*P
11 紫光 + 25%Sr4Al14025 :Eu2+, Dy+ +20%Sr3Si05:Eu2+, Dy +
+15%CaS:Bi +, Na+ +10%C¾MgSi207 :Eu2+, Dy +
10%Sr2MgSi207 :Eu2+, Dy+
+10%CaSrS:Bi + 10%Y202S:Mg, Ti
12 紫光
+35%Sr4Al14025 :Eu2+, Dy+ +25%Y203*Al203*Si02:Ce*B*Na*P +5%CaS： Bi3+， Na++5%CaS： Cu+， Na+
13 紫外 40%Sr2MgSi207 :Eu2+, Dy+ 60%Y3Al5012:Ce
14 紫外 30%Sr4Al14025 :Eu2+, Dy+ 70%Tb3Al5012:Ce
20%Sr2MgSi207 :Eu2+, Dy+
15 紫外 45%Y203*Al203*Si02:Ce*B*Na*P
+ 35%Sr4Al14025 :Eu2+, Dy+
10%Sr2MgSi207 :Eu2+, Dy+ 30%Y203*Al203*Si02:Ce*B*Na*P
16 紫外 + 25%Sr4Al14025 :Eu2+, Dy+ +15%Sr3Si05:Eu2+, Dy +
+5%CaS:Bi +, Na+ +15%C¾MgSi207 :Eu2+, Dy+
15%Sr2MgSi207 :Eu2+, Dy+
+5% CaSrS:Bi +
20%Y202S:Mg, Ti
17 紫外 +10%Sr4Al14025 :Eu2+, Dy+
+40%Y203*Al203*Si02:Ce*B*Na*P +5%CaS:Bi +, Na+
+5%CaS:Cu+, Na+
10%Sr2MgSi207 :Eu2+, Dy+ 15%Sr3Si05:Eu2+, Dy +
18 紫外 +5%CaSrS:Bi + +15%C¾MgSi207 :Eu2+, Dy+
+35%Sr4Al14025 :Eu2+, Dy+ + 20%Y3Al5012:Ce 制备方法如下： 将发光材料 A和 B过 500目筛， 然后按实施例 1一 18中所描述的比例将 A和 B材料混合均匀后使用功率为 0.1W的 LED芯片封装， 做成基本单元如图 1的 LED白光照 明装置。 脉冲电流频率为 100赫兹。
试验例 1 本发明 LED发光装置发光特性
由于本实施例使用的脉冲电流频率为 100赫兹， 也就是周期为 10毫秒， 表 2给出了实施 例 1一 18 所给出的 LED芯片直接接入交流市电、 如图 1模块所示的发光器件用每秒拍 300张 照片的高速摄像机测试的 20毫秒内的发光亮度。参比样为市售蓝光芯片封装上黄色发光材料 的白光 LED芯片按同一方式组成的脉冲电流驱动 LED照明装置。 表 2中亮度数据为仪器的测 表 2
3. 33 6. 66 9. 99
时间
毫秒 毫秒 毫秒
参比样亮度 3565 3466 69 3253 3570 81 实施例 1亮度 3436 3425 1835 3487 3500 1916 实施例 2 3160 3230 1760 2980 3123 1783 实施例 3 2786 2963 1600 2935 2963 1562 实施例 4 2790 2900 1652 2723 2845 1593 实施例 5 2543 2669 1512 2711 2814 1612 实施例 6 2621 2736 1650 2789 2698 1701 实施例 Ί 2317 2423 1502 2504 2642 1490 实施例 8 2793 2851 1711 2860 2894 1723 实施例 9 2714 2802 1250 2732 2800 1196
鞭 C
实施例 10 2316 2631 1436 2403 2532 1399 实施例 11 2588 2723 1563 2711 2733 1600 实施例 12 2222 2434 1436 2412 嬾 2D C436 1283 实施例 13 2633 2749 1504 2737 2765 1490 实施例 14 2763 2810 1477 2677 2714 1511 实施例 15 2454 2671 1512 2555 2545 156、 ,3 ∞
实施例 16 2637 2697 1400 2710 2721 1507 实施例 17 2332 2431 1365 2412 2455 1400 实施例 18 2679 2788 1566 2757 2800 1571 从表 2的数据说明本发明在脉冲电流周期中的发光较为稳定， 而使用现有市售蓝光芯片 封装上传统不具有余辉的的黄色 YAG发光材料的白光 LED照明装置获得的发光不稳定， 在脉 冲周期内起伏极大。
试验例 2 本发明 LED发光装置的光衰
表 3给出了实施例 1一 18和参比样的光衰数据。 参比样为将市售蓝光芯片封装上黄色发 光材料的白光 LED芯片按目前通用的直流供电方式安装的照明装置。 测试方法如下： 将实施 例 1一 18所述脉冲电流驱动 LED照明装置和参比样通电后在一定间隔时间内测其发光亮度， 结果如表 3所示。 表 3中数据为相对亮度， 以最初数据归一化。
表 3 时间 1小时 1000小时 1500小时 2500小时 参比样亮度 100 98 97 94 实施例 1亮度 100 99. 8 99. 4 99. 2 实施例 2 100 99. 5 99. 1 99 实施例 3 100 99. 5 99 98. 6 实施例 4 100 99. 7 99. 3 99 实施例 5 100 99. 8 99. 5 98. 7 实施例 6 100 99. 5 99 98 实施例 Ί 100 99. 4 99 98. 3 实施例 8 100 99. 7 99. 2 99 实施例 9 100 99. 5 99 98 实施例 10 100 99. 6 99 98. 6 实施例 11 100 99. 5 99 98 实施例 12 100 99. 4 99 98. 3 实施例 13 100 99. 5 99 98 实施例 14 100 99. 6 99. 2 98 实施例 15 100 99. 5 99. 1 98. 3 实施例 16 100 99. 8 99. 2 99 实施例 17 100 99. 5 99. 3 98. 5 实施例 18 100 99. 5 99. 4 98. 4 从表 3的数据可以看出本发明的脉冲电流驱动白光 LED照明装置的亮度衰减要小于采用 现有方式的 LED照明装置。
表 2— 3 的数据说明， 本发明的使用具有余辉特性发光材料制备的脉冲电流驱动的白光 LED照明装置具有发光稳定以及光衰小的优点， 与现有 LED照明装置相比具有明显的新颖性 和创造性。

Claims

权利要求书
1、 脉冲电流驱动的白光 LED照明装置， 其特征在于： 所述白光 LED照明装置内部封装的 芯片为蓝光、 紫光或紫外 LED芯片， 其发光涂层采用的发光材料为蓝色余辉发光材料 A与黄 色发光材料 B的组合， 其中， 蓝色余辉发光材料 A与黄色发光材料 B的重量配比为 10~70wt% ： 30~90wt%; 所述的白光 LED照明装置使用频率不小于 50赫兹的脉冲电流驱动 LED芯片。
2、 根据权利要求 1所述的脉冲电流驱动的白光 LED照明装置， 其特征在于： 蓝色余辉发 光材料 A与黄色发光材料 B的重量配比为： 20~50wt%： 50~80wt%o
3、根据权利要求 1或 2所述的脉冲电流驱动的白光 LED照明装置， 其特征在于： 所述蓝 色余辉发光材料 A的发光波长峰值在 440~490纳米之间。
4、根据权利要求 3所述的脉冲电流驱动的白光 LED照明装置， 其特征在于： 所述蓝色余 辉发光材料 A为 Sr4Al14025:Eu2+,Dy3+、 Sr2MgSi207:Eu2+,Dy3+、 CaS:Bi3+,Na+ CaS:Cu+,Na+或 CaSrS:Bi3+中的至少一种。
5、根据权利要求 1或 2所述的脉冲电流驱动的白光 LED照明装置， 其特征在于： 黄色发 光材料 B的发光波长峰值在 520~580纳米之间。
6、根据权利要求 5所述的脉冲电流驱动白光 LED照明装置， 其特征在于： 黄色发光材料
B是具有余辉现象的发光材料、 不具有余辉的黄色发光材料， 或二者混合。
7、根据权利要求 5所述的脉冲电流驱动白光 LED照明装置， 其特征在于： 黄色发光材料 B 是： Y203*Al203*Si02 : Ce*B*Na*P、 Y202S : Mg，Ti、 Sr3Si05 : Eu2+, Dy3+、 C¾MgSi207 : Eu +, Dy \
CaS:Sm3+、 YAG : Ce或 TAG: Ce中的至少一种。
8、 根据权利要求 1~7任一项所述的脉冲电流驱动的白光 LED照明装置， 其特征在于： 所述发光涂层为蓝色余辉发光材料 A与黄色发光材料 B混合后的涂层。
9、 根据权利要求 1~7任一项所述的脉冲电流驱动的白光 LED照明装置， 其特征在于： 所述发光涂层为蓝色余辉发光材料 A的涂层， 黄色发光材料 B的涂层。
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