CN104327845B - 蓝光偏振薄膜、其制备方法及蓝光背光源和液晶显示装置 - Google Patents
蓝光偏振薄膜、其制备方法及蓝光背光源和液晶显示装置 Download PDFInfo
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Abstract
本发明公开了一种蓝光偏振薄膜、其制备方法及蓝光背光源和液晶显示装置。本发明的蓝光偏振薄膜，为通过镁铝水滑石和三(8-羟基喹啉-5-磺酸)铝交替沉积形成的多层薄膜。本发明的蓝光偏振薄膜的荧光光谱的最大发射值为470-490nm，在蓝光区内，且荧光各向异性值为0.1-0.2，具有偏振特性，可以用于液晶显示器背光源。
Description
技术领域
本发明涉及有机电致发光技术，尤其涉及一种蓝光偏振薄膜、其制备方法及蓝光背光源和液晶显示装置。
背景技术
在有机电致发光器件研制过程中，由于蓝光材料比较稀缺，如何实现蓝光发射一直是一个核心的问题。如果能够实现蓝光发射，可以进一步与绿光和红光发射材料构成三基色发射，从而得到白光发射。
在现有技术中，为达到一定的均匀的荧光强度需要将发光物质引入到无机基质或聚合物中。采用这种方法，发光材料的合成难度增加，发光薄膜的均一性调控有难度，并且从成本上说达到相同荧光强度耗费的发光物质较多。
发明内容
本发明的目的是提供一种蓝光偏振薄膜、其制备方法及蓝光背光源。
本发明所提供的蓝光偏振薄膜，其为通过镁铝水滑石和三(8-羟基喹啉-5-磺酸)铝交替沉积形成的多层薄膜。
其中，所述多层薄膜为4-10层。
其中，镁铝水滑石层的厚度为10-20nm；三(8-羟基喹啉-5-磺酸)铝层的厚度为10-20nm。
其中，所述荧光光谱的最大发射值为470-490nm。
其中，所述蓝光偏振薄膜为通过将基底浸入10-20g/L镁铝水滑石溶液中10-15min，取出吹干，然后再浸入3-10g/L三(8-羟基喹啉-5-磺酸)铝溶液中10-15min，取出吹干，如此完成一个循环，重复上述循环而获得的多层薄膜。
本发明所提供的蓝光偏振薄膜的制备方法，包括将基底浸入10-20g/L镁铝水滑石溶液中10-15min，取出吹干，然后再浸入3-10g/L三(8-羟基喹啉-5-磺酸)铝溶液中10-15min，取出吹干，如此完成一个循环，重复上述循环而获得的多层薄膜。
其中，重复上述循环2-5次。
本发明所提供的蓝光背光源，其包括上述任一所述的蓝光偏振薄膜。
本发明所提供的液晶显示装置，包括上偏振片、彩膜基板、液晶层、阵列基板、下偏振片和背光源，其中所述背光源为上述蓝光背光源。
本发明的蓝光偏振薄膜的荧光光谱的最大发射值为470-490nm，在蓝光区内，且荧光各向异性值为0.1-0.2，具有偏振特性，可以用于液晶显示器背光源，既有发光特性又有偏振特性，改变了传统液晶显示器既在靠近背光源侧使用偏振片又需要在背光源中使用发光材料的劣势。
具体实施方式
本发明的蓝光偏振薄膜为通过镁铝水滑石和三(8-羟基喹啉-5-磺酸)铝交替沉积形成的多层薄膜。通过交替沉积方法获得的薄膜均匀致密并且因为单层膜的厚度可以精确控制并且重复沉积的膜的厚度可控，薄膜的发光强度可以通过控制沉积的层数来精确调控。本发明的交替沉积方法中使用的蓝光材料(由三(8-羟基喹啉-5-磺酸)铝薄膜形成)浓度较低，另外镁铝水滑石起到隔离两蓝光材料薄膜的作用，避免了蓝光材料的荧光淬灭。因此多层薄膜的层数越多，沉积的蓝光材料越多，蓝光强度也会越高。
其中，多层薄膜为4-10层，镁铝水滑石层的厚度为10-20nm；三(8-羟基喹啉-5-磺酸)铝层的厚度为10-20nm。
其中，蓝光偏振薄膜的荧光光谱的最大发射值为470-490nm，其均在蓝光区。
其中，所述蓝光偏振薄膜为通过将基底浸入10-20g/L镁铝水滑石溶液中10-15min，取出吹干，然后再浸入3-10g/L三(8-羟基喹啉-5-磺酸)铝溶液中10-15min，取出吹干，如此完成一个循环，重复上述循环而获得的多层薄膜。
本发明的蓝光背光源，其包括上述任一所述的蓝光偏振薄膜。
本发明所提供的液晶显示装置，包括上偏振片、彩膜基板、液晶层、阵列基板、下偏振片和背光源，其中所述背光源为上述蓝光背光源。
实施例1.蓝光偏振薄膜的制备
1.1镁铝水滑石的制备
镁铝水滑石，其结构式为Mg2Al(OH)6NO3LDH([Mg2Al(OH)6NO3].xH2O)，按照摩尔比为2：1的比例称取Mg(NO3)2·6H2O和Al(NO3)3·6H2O，然后将它们溶解在100mL去离子水溶液中，其中Mg(NO3)2·6H2O的浓度控制为0.02mol/L，转移到三口烧瓶内，氮气保护下进行搅拌，用0.5mol/LNaOH溶液滴定到pH＝8.0，将混合溶液转移到反应釜中并于80℃烘箱中反应48h，反应后产物离心洗涤干燥即得到目标产物Mg2Al(OH)6NO3LDH。
1.2.镁铝水滑石溶液的制备
取1gMg2Al(OH)6NO3LDH加入到100mL甲酰胺中搅拌16h得到LDH的甲酰胺剥层溶液，该溶液带正电荷。
1.3三(8-羟基喹啉-5-磺酸)铝的制备
称1.35g8-羟基喹啉-5-磺酸溶解于150mL水中，转移到三口烧瓶内，加入0.24gNaOH充分搅拌。然后加入0.27g的氯化铝，用1mol/LNaOH溶液调pH＝8.0，室温搅拌12h进行反应。反应后的溶液90℃水浴蒸干后，乙醇洗涤得到黄绿色固体，将其溶解在100mL甲醇中，然后再加入乙醚萃取获得目标产物三(8-羟基喹啉-5-磺酸)铝。
表1.三(8-羟基喹啉-5-磺酸)铝元素分析结果
| C％ | N％ | H％ | |
| 实测 | 33.78 | 4.35 | 3.12 |
| 理论 | 33.78 | 4.38 | 3.81 |
1.4三(8-羟基喹啉-5-磺酸)铝溶液的制备
用水配制3g/L三(8-羟基喹啉-5-磺酸)铝水溶液，该溶液带负电荷。
1.5蓝光偏振薄膜的制备
将ITO基底浸入镁铝水滑石溶液中10min，吹干后再浸入三(8-羟基喹啉-5-磺酸)铝溶液中10min吹干，完成一个循环。重复上述循环3次，获得蓝光偏振薄膜。该蓝光偏振薄膜中镁铝水滑石和三(8-羟基喹啉-5-磺酸)铝通过静电作用结合在一起。(通过扫描式电子显微镜测定镁铝水滑石和三(8-羟基喹啉-5-磺酸)铝层的厚度均为10nm)
1.6发光光谱测试
其中，激发光波长为360nm。结果如表2所示。
表2
通过表2可以看出，本实施例制备的蓝光偏振薄膜的荧光光谱的最大发射值为476nm，在蓝光区内。
实施例2.蓝光偏振薄膜的制备
2.1镁铝水滑石的制备
镁铝水滑石，其结构式为Mg2Al(OH)6NO3LDH([Mg2Al(OH)6NO3].xH2O)。按照摩尔比为2：1的比例称取Mg(NO3)2·6H2O和Al(NO3)3·6H2O，然后将它们溶解在100mL去离子水溶液中，其中Mg(NO3)2·6H2O的浓度控制在0.12mol/L，转移到三口烧瓶内，氮气保护下进行搅拌，用0.5mol/LNaOH溶液滴定到pH＝10.5，将混合溶液转移到反应釜中并于160℃烘箱中反应10h，反应后产物离心洗涤干燥即得到目标产物Mg2Al(OH)6NO3LDH。
2.2.镁铝水滑石溶液的制备
取2gMg2Al(OH)6NO3LDH加入到100mL甲酰胺中搅拌16h得到LDH的甲酰胺剥层溶液，该溶液带正电荷。
2.3三(8-羟基喹啉-5-磺酸)铝的制备
称1.35g8-羟基喹啉-5-磺酸溶解于150mL水中，转移到三口烧瓶内，加入0.24gNaOH充分搅拌。然后加入0.27g的氯化铝，用1mol/LNaOH溶液调pH＝8.0，室温搅拌12h进行反应。反应后的溶液90℃水浴蒸干后，乙醇洗涤得到黄绿色固体，将其溶解在100mL甲醇中，然后再加入乙醚萃取获得目标产物三(8-羟基喹啉-5-磺酸)铝。
表3.三(8-羟基喹啉-5-磺酸)铝元素分析结果
| C％ | N％ | H％ | |
| 实测 | 33.78 | 4.35 | 3.12 |
| 理论 | 33.78 | 4.38 | 3.81 |
2.4三(8-羟基喹啉-5-磺酸)铝溶液的制备
用水配制10g/L三(8-羟基喹啉-5-磺酸)铝水溶液，该溶液带负电荷。
2.5蓝光偏振薄膜的制备
将ITO基底浸入镁铝水滑石溶液中15min，吹干后再浸入三(8-羟基喹啉-5-磺酸)铝溶液中15min吹干，完成一个循环。重复上述循环3次，获得蓝光偏振薄膜。该蓝光偏振薄膜中镁铝水滑石和三(8-羟基喹啉-5-磺酸)铝通过静电作用结合在一起。(通过扫描式电子显微镜测定，镁铝水滑石和三(8-羟基喹啉-5-磺酸)铝层的厚度均为20nm)
1.6发光光谱测试
其中，激发光波长为360nm。结果如表4所示。
表4
通过表4可以看出本实施例制备的蓝光偏振薄膜的荧光光谱的最大发射值为480nm，在蓝光区内。
以上说明对本发明而言只是说明性的，而非限制性的，本领域普通技术人员理解，在不脱离所附权利要求所限定的精神和范围的情况下，可做出许多修改、变化或等效，但都将落入本发明的保护范围内。
Claims (12)
1.一种蓝光偏振薄膜，其为通过镁铝水滑石和三(8-羟基喹啉-5-磺酸)铝交替沉积形成的多层薄膜；所述蓝光偏振薄膜为通过将基底浸入10-20g/L镁铝水滑石溶液中10-15min，取出吹干，然后再浸入3-10g/L三(8-羟基喹啉-5-磺酸)铝溶液中10-15min，取出吹干，如此完成一个循环，重复上述循环而获得的多层薄膜。
2.根据权利要求1所述的蓝光偏振薄膜，其特征在于，所述多层薄膜为4-10层的多层薄膜。
3.根据权利要求1或2所述的蓝光偏振薄膜，其特征在于，所述镁铝水滑石层的厚度为10-20nm，所述三(8-羟基喹啉-5-磺酸)铝层的厚度为10-20nm。
4.根据权利要求1或2所述的蓝光偏振薄膜，其特征在于，所述蓝光偏振薄膜的荧光光谱的最大发射值为470-490nm。
5.一种蓝光偏振薄膜的制备方法，包括将基底浸入10-20g/L镁铝水滑石溶液中10-15min，取出吹干，然后再浸入3-10g/L三(8-羟基喹啉-5-磺酸)铝溶液中10-15min，取出吹干，如此完成一个循环，重复上述循环而获得的多层薄膜。
6.根据权利要求5所述的制备方法，其特征在于，重复上述循环2-5次。
7.根据权利要求5所述的制备方法，其特征在于，所述镁铝水滑石按照如下方法制备：按照摩尔比为2：1的比例称取Mg(NO3)2·6H2O和Al(NO3)3·6H2O，然后将它们溶解在100mL去离子水溶液中，其中Mg(NO3)2·6H2O的浓度控制为0.12mol/L，转移到三口烧瓶内，氮气保护下进行搅拌，用0.5mol/LNaOH溶液滴定到pH＝8.0-10.5，将混合溶液转移到反应釜中并于80℃-160℃烘箱中反应10-48h，反应后产物离心洗涤干燥即得到目标产物Mg2Al(OH)6NO3LDH。
8.根据权利要求5所述的制备方法，其特征在于，所述三(8-羟基喹啉-5-磺酸)铝按照如下方法制备：
称1.35g8-羟基喹啉-5-磺酸溶解于150mL水中，转移到三口烧瓶内，加入0.24gNaOH充分搅拌；然后加入0.27g的氯化铝，用1mol/LNaOH溶液调pH＝8.0，室温搅拌12h进行反应；反应后的溶液90℃水浴蒸干后，乙醇洗涤得到黄绿色固体，将其溶解在100mL甲醇中，然后再加入乙醚萃取获得目标产物三(8-羟基喹啉-5-磺酸)铝。
9.根据权利要求5所述的制备方法，其特征在于，所述镁铝水滑石溶液为镁铝水滑石甲酰胺溶液。
10.根据权利要求5所述的制备方法，其特征在于，所述三(8-羟基喹啉-5-磺酸)铝溶液为三(8-羟基喹啉-5-磺酸)铝水溶液。
11.一种蓝光背光源，其包括权利要求1-4中任一所述的蓝光偏振薄膜。
12.一种液晶显示装置，包括上偏振片、彩膜基板、液晶层、阵列基板、下偏振片和背光源，其特征在于，所述背光源为权利要求11所述的蓝光背光源。
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