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White‐Light Emission from an Integrated Upconversion Nanostructure: Toward Multicolor Displays Modulated by Laser Power
Author(s) -
Zhang Cheng,
Yang Liang,
Zhao Jun,
Liu Bianhua,
Han MingYong,
Zhang Zhongping
Publication year - 2015
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201504518
Subject(s) - photon upconversion , backlight , materials science , excitation , wavelength , laser , optoelectronics , optics , nanostructure , white light , physics , nanotechnology , liquid crystal display , luminescence , quantum mechanics
The white backlight in displays is generated by optimizing the proportions of individual emitters with different wavelengths by variations in materials composition, phase, and structure. Color pixels usually result from the separation of white light or the excitation with multiwavelength or multipulse sources. However, it is a challenge to develop a material that comprises a single structure and emits over the full visible spectrum, but where the emission wavelengths can be controlled by a simple excitation source. Herein, we report an upconversion nanostructure that incorporates several lanthanide ions in the same core@shell@shell structure. The combination of multiple narrow spectral bands results in the emission of white light. The emission colors can be tuned by changing the excitation power density, which manipulates the photon transfer pathways. Applications such as flat‐panel displays and imaging have been demonstrated.