Journal
SMALL
Volume 15, Issue 38, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201901983
Keywords
colloidal quantum wells; dual emission; impurity doping; light-emitting diodes; nanoplatelets
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Funding
- National Research Foundation, Prime Minister's Office, Singapore under its Investigatorship program [NRF-NRFI2016-08]
- Singapore Agency for Science, Technology and Research (A*STAR) SERC Pharos Program [152 73 00025]
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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).
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