Liu Baiquan, Sharma Manoj, Yu Junhong, Shendre Sushant, Hettiarachchi Chathuranga, Sharma Ashma, Yeltik Aydan, Wang Lin, Sun Handong, Dang Cuong, Demir Hilmi Volkan
Luminous! Centre of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering and School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 639798, Singapore.
Centre for OptoElectronics and Biophotonics (COEB), School of Electrical and Electronic Engineering, The Photonics Institute (TPI), Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.
Small. 2019 Sep;15(38):e1901983. doi: 10.1002/smll.201901983. Epub 2019 Aug 5.
Copper-doped colloidal quantum wells (Cu-CQWs) are considered a new class of optoelectronic materials. To date, the electroluminescence (EL) property of Cu-CQWs has not been revealed. Additionally, it is desirable to achieve ultrapure green, tunable dual-emission and white light to satisfy the various requirement of display and lighting applications. Herein, light-emitting diodes (LEDs) based on colloidal Cu-CQWs are demonstrated. For the 0% Cu-doped concentration, the LED exhibits Commission Internationale de L'Eclairage 1931 coordinates of (0.103, 0.797) with a narrow EL full-wavelength at half-maximum of 12 nm. For the 0.5% Cu-doped concentration, a dual-emission LED is realized. Remarkably, the dual emission can be tuned by manipulating the device engineering. Furthermore, at a high doping concentration of 2.4%, a white LED based on CQWs is developed. With the management of doping concentrations, the color tuning (green, dual-emission to white) is shown. The findings not only show that LEDs with CQWs can exhibit polychromatic emission but also unlock a new direction to develop LEDs by exploiting 2D impurity-doped CQWs that can be further extended to the application of other impurities (e.g., Mn, Ag).
铜掺杂胶体量子阱（Cu-CQWs）被认为是一类新型的光电子材料。迄今为止，Cu-CQWs的电致发光（EL）特性尚未被揭示。此外，实现超纯绿色、可调谐双发射和白光以满足显示和照明应用的各种需求是很有必要的。在此，展示了基于胶体Cu-CQWs的发光二极管（LED）。对于0%的铜掺杂浓度，该LED的国际照明委员会1931色度坐标为（0.103, 0.797），半高宽处的EL全波长较窄，为12 nm。对于0.5%的铜掺杂浓度，实现了双发射LED。值得注意的是，双发射可以通过器件工程来调节。此外，在2.4%的高掺杂浓度下，开发了基于CQWs的白色LED。通过控制掺杂浓度，实现了颜色调谐（从绿色、双发射到白色）。这些发现不仅表明基于CQWs的LED可以呈现多色发射，还为通过利用二维杂质掺杂CQWs开发LED开辟了一个新方向，这可以进一步扩展到其他杂质（如Mn、Ag）的应用。
