CN202948978U - 一种立方氮化硼薄膜促进芯片散热的白光led器件 - Google Patents
一种立方氮化硼薄膜促进芯片散热的白光led器件 Download PDFInfo
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- CN202948978U CN202948978U CN2012205854847U CN201220585484U CN202948978U CN 202948978 U CN202948978 U CN 202948978U CN 2012205854847 U CN2012205854847 U CN 2012205854847U CN 201220585484 U CN201220585484 U CN 201220585484U CN 202948978 U CN202948978 U CN 202948978U
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Abstract
本实用新型公开的立方氮化硼薄膜促进芯片散热的白光LED器件,包括衬底,在衬底上生长有立方氮化硼薄膜,立方氮化硼薄膜与外部散热器相连,在立方氮化硼薄膜上固定有n个并联或串联的LED芯片,n≥1,LED芯片的两个电极与引出线相连,LED芯片与引出线由荧光粉胶封装。本实用新型的LED器件结构工艺简单,在LED芯片和衬底之间加入了一层立方氮化硼薄膜,利用立方氮化硼的高热导率,从横向和纵向两个通道同时向外传输芯片产生的热量,从而提高LED的散热效果,延长使用寿命。
Description
技术领域
本实用新型涉及一种白光LED器件,尤其是提高LED芯片散热的白光LED器件。
背景技术
发光二级管(LED)具有节能、环保、使用寿命长、无辐射、发光效率高等显著优点,被认为是继白炽灯、荧光灯、高强度气体放电灯之后的第四代光源。我国是全球第二大耗能国,照明用电量约占全部电能消耗的12%—15%。LED的耗电仅为白炽灯的1/8、荧光灯的1/2,发展LED照明对节能减排意义重大。
然而,目前LED的发光效率仅能达到10%~20%,其余的能量仍然转化为热能。如果芯片产生的热量不能及时、高效地从PN结散发出来,将导致PN结的结温快速升高,严重影响LED的发光性能和使用寿命。同时,温度升高会导致树脂的透明度下降,严重影响透光性能,减弱LED的光输出。功率型白光LED通过提高芯片的输入功率,或者将多个芯片按照阵列模块方式封装在一起,来提高亮度。但是,两种方法均使LED的热流密度急剧增加。因此,散热已成为制约LED应用的瓶颈。
典型的LED的散热主要依靠主要传导和对流方式,其散热通道为:芯片结—外延层—封装基板—散热装置—周围环境,散热通道以纵向为主。以氮化镓LED芯片为例。因为LED封装时所采用的部分材料的导热性能差。LED工作时芯片产生的热量,来不及及时传输出来,引起局部高温。从芯片到周围环境的传热通道成为散热的瓶颈。
发明内容
鉴于现有技术存在的芯片散热不佳的缺点,本实用新型的目的是提供一种立方氮化硼薄膜促进芯片散热的白光LED器件。
本实用新型的立方氮化硼薄膜促进芯片散热的白光LED器件,包括衬底,在衬底上生长有立方氮化硼薄膜,立方氮化硼薄膜与外部散热器相连,在立方氮化硼薄膜上固定有n个并联或串联的LED芯片,n≥1,LED芯片的两个电极与引出线相连,LED芯片与引出线由荧光粉胶封装。
上述的衬底可以是硅片、蓝宝石片、金刚石薄膜、陶瓷片、或金属薄片。所说的LED芯片可以是蓝宝石基氮化镓二极管发光芯片、碳化硅基氮化镓二极管发光芯片、或硅基氮化镓二极管发光芯片。所说的荧光粉胶是添加有荧光粉的环氧树脂、硅胶或聚碳酸酯。
上述的在衬底上生长立方氮化硼薄膜可以采用CN1850589或CN101565822的方法制备获得。
本实用新型的LED器件结构工艺简单,在LED芯片和衬底之间加入了一层立方氮化硼薄膜,利用立方氮化硼的优异热导率(1300W/m*K),使LED芯片产生的大部分热量,通过立方氮化硼薄膜层迅速横向传输到外部散热器上;这样,芯片产生的热量,可以同时从横向和纵向向外传输,达到散热的效果,提高LED器件的散热性能,延长LED的使用寿命。
附图说明
图1是立方氮化硼薄膜促进芯片散热的白光LED器件示意图。
图中,1为外部散热器;2为外部电极;3为LED芯片;4为引出线;5为电极;6荧光粉胶;7为立方氮化硼薄膜;8为衬底;9为导热胶。
具体实施方式
以下结合附图对本实用新型作进一步描述。
参照图1,本实用新型的白光LED器件包括衬底8,在衬底8上有采用CN1850589或CN101565822方法生长的立方氮化硼薄膜7,立方氮化硼薄膜7与外部散热器1相连,n个并联或串联的LED芯片3用导热胶9固定在立方氮化硼薄膜7上,n≥1,LED芯片3的两个电极5与引出线4相连,通过引出线使LED芯片的两个电极连接到外部电极2上,LED芯片与引出线用荧光粉胶6封装。
芯片工作时产生的热量,可以同时从横向和纵向两个通道向外部传输到散热器上,从而提高芯片的散热效果,延长LED的使用寿命。
上述具体实施方式仅是本实用新型的具体实施例子,本实用新型不限于以上实施例子,在本实用新型的精神和权利要求的保护范围内,对本实用新型作出的任何修改和改变,均应认为是落入本实用新型的保护范围。
Claims (4)
1.一种立方氮化硼薄膜促进芯片散热的白光LED器件,其特征在于包括衬底(8),在衬底(8)上生长有立方氮化硼薄膜(7),立方氮化硼薄膜(7)与外部散热器(1)相连,在立方氮化硼薄膜(7)上固定有n个并联或串联的LED芯片(3),n≥1,LED芯片(3)的两个电极(5)与引出线(4)相连,LED芯片(3)与引出线(4)由荧光粉胶(6)封装。
2.根据权利要求书1所述的立方氮化硼薄膜促进芯片散热的白光LED器件,其特征在于所说的衬底(8)是硅片、蓝宝石片、金刚石薄膜、陶瓷片、或金属薄片。
3.根据权利要求书1所述的立方氮化硼薄膜促进芯片散热的白光LED器件,其特征在于所说的LED芯片(3)是蓝宝石基氮化镓二极管发光芯片、碳化硅基氮化镓二极管发光芯片、或硅基氮化镓二极管发光芯片。
4.根据权利要求书1所述的立方氮化硼薄膜促进芯片散热的白光LED器件,其特征在于所说的荧光粉胶(6)是添加有荧光粉的环氧树脂、硅胶或聚碳酸酯。
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CN102931333A (zh) * | 2012-11-08 | 2013-02-13 | 杭州天柱科技有限公司 | 立方氮化硼薄膜促进芯片散热的白光led器件 |
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CN102931333A (zh) * | 2012-11-08 | 2013-02-13 | 杭州天柱科技有限公司 | 立方氮化硼薄膜促进芯片散热的白光led器件 |
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