A poly(urethane)-encapsulated benzo[2,3-d:6,7-d′]diimidazole organic down-converter for green hybrid LEDs,Materials Chemistry Frontiers

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A poly(urethane)-encapsulated benzo[2,3-d:6,7-d′]diimidazole organic down-converter for green hybrid LEDs
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2020/02/06 , DOI: 10.1039/c9qm00771g
Alan A. Wiles _{1,

2,

3,

4,

5} , Jochen Bruckbauer _{4,

5,

6,

7,

8} , Nabeel Mohammed _{1,

2,

3,

4,

5} , Michele Cariello _{1,

2,

3,

4,

5} , Joseph Cameron _{1,

2,

3,

4,

5} , Neil J. Findlay _{1,

2,

3,

4,

5} , Elaine Taylor-Shaw _{4,

5,

6,

7,

8} , David J. Wallis _{5,

9,

10,

11,

12} , Robert W. Martin _{4,

5,

6,

7,

8} , Peter J. Skabara _{1,

2,

3,

4,

5} , Graeme Cooke _{1,

2,

3,

4,

5}

Affiliation

The development of organic down-converting materials continues to attract attention in hybrid LED technology by obviating the need for non-sustainable rare-earth elements. In this work, a benzodiimidazole-based system (TPA-BDI) has been employed as a down-converting layer in a hybrid organic–inorganic LED device. A commercially available poly(urethane)-based resin is used as the encapsulating material, providing a dilute layer of TPA-BDI that is deposited on top of the GaN-based LED. Crucially, the solution-state emissive performance is generally maintained when encapsulated at low concentrations within this resin. A maximum luminous efficacy of 87 lm W⁻¹ was demonstrated using a 1.0 mg ml⁻¹ concentration of TPA-BDI in the resin. The suitability of using organic down-converters to produce green light from hybrid devices was demonstrated by the excellent repeatability of the device characteristics across a series of encapsulated LEDs.

中文翻译：

用于绿色混合LED的聚氨基甲酸酯封装的苯并[2,3-d：6,7-d']二咪唑有机下变频器

通过消除对非可持续稀土元素的需求，有机下转换材料的开发继续在混合LED技术中引起关注。在这项工作中，基于苯并二咪唑的系统（TPA-BDI）被用作有机-无机混合LED器件的下转换层。将可商购的基于聚氨基甲酸酯的树脂用作封装材料，以提供TPA-BDI的稀释层，该层沉积在基于GaN的LED顶部。至关重要的是，当以低浓度封装在该树脂中时，通常可以保持溶液状态的发射性能。使用1.0 mg ml ^-1浓度的TPA-BDI证明最大发光效率为87 lm W ^-1在树脂中。在一系列封装的LED上，器件特性的出色可重复性证明了使用有机下变频器从混合器件产生绿光的适用性。

更新日期：2020-03-05

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