Asymmetric Synthesis and Study of Platinum Metallahelicenes in Circularly Polarised Phosphorescent Organic Light Emitting Diodes (CP-PHOLEDs)

有机发光二极管（OLED）需要位于两个电极之间的有机半导体材料的发射电致发光层，其中至少一个电极是透明的。由于尺寸薄、切换速度快和对比度高，这些设备正在革新显示技术。事实上，目前这种设备的市场价值超过25亿美元。发射圆偏振电致发光（CPEL）的器件在光子技术中应该具有巨大的转化潜力，例如改进的LCD背光、彩色图像检测和立体显示、光通信和量子计算，然而迄今为止，直接产生CPEL的问题尚未解决。该技术的成功开发依赖于可控圆偏振、可调谐发射波长和高色纯度的发光器件的生产。虽然宽带反射偏振器可以用作OLED器件中的无源部件以实现CPEL，但直接产生CPEL将更加优雅，并且在能量效率和生产成本方面是有利的。本研究将开发有效的方法来合成本征手性磷光分子，并使用这些来制造CP电致发光器件，试图证明高效的CPEL。圆偏振电致发光（CPEL）的成功直接产生将对包括物理学和材料科学在内的一系列学科产生变革性影响。这项工作将对现有知识产生重大影响，可在若干翻译领域加以利用。英国是OLED技术的先驱，需要新的创新来保持这一地位。事实上，前首席科学顾问大卫金爵士（Sir David King）已经认识到了这一潜力，他强调：“在英国，我们在一项可能消灭硅芯片的技术上处于世界领先地位”。以替代LCD背光作为开发这项工作的一个例子，目前的技术依赖于偏振滤光片，有效地切断了这些显示器中使用的75%的光。加上滤色器和设备界面的吸收，只有4%的光被透射。使用偏振光源，加上可调的颜色组件将消除这种需要，从而导致显着更节能的显示器。这种具有较低碳足迹的显示器将具有明显的环境影响。

Organic light emitting diodes (OLEDs) require an emissive electroluminescent layer of an organic semiconductor material located between two electrodes, where at least one of the electrodes is transparent. Such devices are revolutionising display technologies due to thin dimensions, faster switching and higher contrast ratios. Indeed, currently the market for such devices is valued at >$2.5B. Devices that emit circularly polarised electroluminescence (CPEL) should have vast translational potential in photonic technology, such as improved LCD backlighting, colour-image detection and stereoscopic displays, optical communication, and quantum computing, however to date the problem of directly generating CPEL has not been solved. Successful development of this technology is reliant on the production of light-emitting devices of controllable circular polarisation, tuneable emission wavelength, and high colour purity. While wide-band reflective polarisers may be used as passive components in OLED devices to achieve CPEL, the direct generation of CPEL would be far more elegant, and favourable in terms of energy efficiency and production cost. This research will develop efficient methods to synthesise intrinsically chiral phosphorescent molecules and use these to fabricate CP electroluminescent devices, in an attempt to demonstrate highly efficient CPEL. The successful direct generation of circularly polarised electroluminescence (CPEL) would have a transformative effect on a range of disciplines including physics and materials science. Such work would have significant impact on current knowledge, which could be exploited in a number of translational areas. The UK is a pioneer of OLED technology and needs new innovation to maintain this position. Indeed, former chief scientific advisor Sir David King has recognised this potential highlighting "in Britain we have a world-leading position in a technology that could wipe out the silicon chip" "I am talking about plastic electronics". Taking alternative LCD backlighting as one example of the exploitation of this work, current technologies rely on polarising filters that effectively cut out 75% of the light used in these displays. Combined with absorption by the colour filters and at device interfaces, only 4% of the light used is transmitted. The use of a polarised light source, coupled with tuneable colour components would remove this need, thus leading to significantly more energy efficient displays. Such displays with a lowered carbon footprint would be of clear environmental impact.