An organic down-converting material for white-light emission from hybrid LEDs.
An organic down-converting material for white-light emission from hybrid LEDs.
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DOI：
10.1002/adma.201402661
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发表时间：
2014-11-19
影响因子：
29.4
通讯作者：
Skabara, Peter J.
中科院分区：
文献类型：
--
作者：
Findlay, Neil J.;Bruckbauer, Jochen;Inigo, Anto R.;Breig, Benjamin;Arumugam, Sasikumar;Wallis, David J.;Martin, Robert W.;Skabara, Peter J.
DOI: 10.1002 / adma。201402661可见光到红外光谱通过形成GaN和InGaN交替薄层的量子阱结构，实现了高效的蓝色发射。这种混合无机/有机LED架构提供了结合两种技术优势的潜力，例如，无机衬底的优异电子性能和有机半导体的广泛可调谐发射此外，在混合led中使用有机材料代替传统荧光粉，将避免行业依赖昂贵的含稀土材料，因为对固态照明的需求正在增长与现有的荧光粉相比，有机材料的响应速度更快，这为可见光通信等应用提供了额外的优势近年来，4,4 -二氟-4-硼酸-3 -氮杂-4-氮杂- 5 -茚二烯单元（以下简称BODIPY）因其在多种溶剂中良好的溶解度、高吸收率和高光致发光效率等特性而受到广泛关注因此，BODIPY是许多应用的代名词，例如生物标记[12]和离子检测传感器[13]利用BODIPY作为发光器件的发射元件是一个有趣的前景，因为它的强和可调的发射特性；然而，虽然吸收带很强烈，但它很窄，并且限制在500 nm左右。[11a]因此，将BODIPY与吸收伙伴单元结合，提供对更高能量波长敏感的更复杂的结构，是开发适合混合LED器件应用的设计有机分子的有用方法。最近，我们报道了一个新的线性低聚芴- bodipys家族，当投射到商用led上时，它们是将紫外光向下转换为可见光的有用化合物在本通讯中，我们介绍了一种新型有机能量下转换材料[BODFluTh] 2FB的合成，并将其作为商用蓝色LED的共发射极应用。由此产生的混合装置在注入电流范围内显示可见白光发射。分子[BODFluTh] 2FB通过化合物1和2的Stille偶联以中等产率制备，分离得到亮橙色粉末（方案1）。采用标准分析方法测定[BODFluTh] 2FB的结构。材料是热稳定的，只有在加热到395℃时才观察到5%的质量损失。通过差示扫描量热法（DSC）获得了额外的热数据，包括Tg（128℃），Tc（191℃）和Tm（315℃和324℃）的热转变。为了确定[BODFluTh] 2FB对光下转换的适用性，记录了二氯甲烷溶液中的紫外-可见吸收和发射光谱（图1a）。近年来，适合作为有机发光二极管（oled）有源元件的材料引起了广泛的兴趣，因为这项技术正在发展，以取代现有的效率较低的技术，例如，在固态照明等消费应用中，白炽灯和荧光灯泡为此，聚合物[2]和分子结构[3]都得到了开发。虽然聚合物具有高发光性和高溶解度，但它们可能存在与高多分散性和批对批再现性相关的问题。分子或低聚体系具有单分散性，合成可重复性等优点，并且根据结构和设备制造要求，它们可以…
DOI: 10.1002/adma. 201402661 the visible to infrared spectrum.[7] Highly efficient blue emission is achieved by forming a quantum well structure of alternating thin layers of GaN and InGaN. Such hybrid inorganic/organic LED architectures offer the potential to combine the advantages of both technologies, for example, the excellent electro nic properties of inorganic substrates and the broad, tunable emission of organic semiconductors.[8] Furthermore, employing an organic material in place of traditional phosphors in hybrid LEDs would avoid an industry dependency on costly rare-earth containing materials as demand for solid-state lighting grows.[9] The higher speed of response of the organic materials compared to the existing phosphors offers additional advantages for applications such as visible light communications.[10] The 4, 4-difluoro-4-borata-3 a-azonia-4 a-aza-s-indacene unit, hereafter referred to as BODIPY, has received widespread attention in recent years due to its attractive combination of properties including good solubility in a range of solvents, high absorptivity and high photoluminescence efficiency.[11] As such, BODIPY is synonymous with numerous applications, such as biological labelling [12] and sensors for ion detection.[13] The use of BODIPY as the emissive component of a luminescent device is an interesting prospect due to its strong and tunable emissive properties; however, although the absorption band is intense, it is narrow and confined to around 500 nm.[11a] Hence, the combination of BODIPY with an absorbing partner unit, providing a more complex structure sensitive to higher energy wavelengths, is a useful method for developing designer organic molecules suitable for application in hybrid LED devices. Recently, we reported a novel family of linear oligofluorene-BODIPYs that are useful compounds for the downconversion of UV light into visible light when drop-cast onto commercially available LEDs.[14] In this communication, we present the synthesis of a novel organic energy down-converting material,[BODFluTh] 2FB, and its application as the coemitter with a commercial blue LED. The resulting hybrid device demonstrates visible white light emission under a range of injection currents. The molecule [BODFluTh] 2FB was prepared via Stille coupling of compounds 1 and 2 in moderate yield and isolated as a bright orange powder (Scheme 1). The structure of [BODFluTh] 2FB was determined using standard analytical methods. The material was thermally stable, with 5% mass loss observed only upon heating to 395 C. Additional thermal data was obtained following differential scanning calorimetry (DSC), with several thermal transitions evident, including values for Tg (128 C), Tc (191 C) and Tm (315 C and 324 C). In order to determine the suitability of [BODFluTh] 2FB for the down-conversion of light, UV–vis absorption and emission spectra were recorded in dichloromethane solution (Figure 1a).Materials suitable as active components in organic light-emitting diodes (OLEDs) have attracted widespread interest in recent years, as this technology develops towards replacing existing less efficient technologies, eg, incandescent and fluorescent bulbs, in consumer applications such as solid-state lighting.[1] To this end, both polymers [2] and molecular structures [3] have been exploited. While polymers offer high luminescence and solubility, they can suffer from problems associated with high polydispersity and batchto-batch reproducibility. Molecular or oligomeric systems offer advantages such as monodispersity, synthetic reproducibility and, depending on structure and device fabrication requirements, they can be …
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