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A Non‐rare‐Earth Ions Self‐Activated White Emitting Phosphor under Single Excitation
Author(s) -
Guo Hongyu,
Zhang Junying,
Ma Lun,
Chavez Jose L.,
Yin Luqiao,
Gao Hong,
Tang Zilong,
Chen Wei
Publication year - 2015
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201502641
Subject(s) - phosphor , materials science , luminescence , color temperature , light emitting diode , color rendering index , optoelectronics , photoluminescence , ion , excitation , diode , quantum yield , optics , fluorescence , chemistry , physics , organic chemistry , electrical engineering , engineering
White light phosphors have many potential applications such as solid‐state lighting, full color displays, light source for plant growth, and crop improvement. However, most of these phosphors are rare‐earth‐based materials which are costly and would be facing the challenge of resource issue due to the extremely low abundance of these elements on earth. A new white color composite consisted of a graphitic‐phase nitrogen carbon (g‐C 3 N 4 ) treated with nitric acid and copper‐cysteamine Cu 3 Cl(SR) 2 is reported herein. Under a single wavelength excitation at 365 nm, these two materials show a strong blue and red luminescence, respectively. It is interesting to find that the white light emission with a quantum yield of 20% can be obtained by mixing these two self‐activated luminescent materials at the weight ratio of 1:1.67. Using a 365 nm near‐ultraviolet chip for excitation, the composite produces a white light‐emitting diode that exhibits an excellent color rendering index of 94.3. These white‐emitting materials are environment friendly, easy to synthesize, and cost‐effective. More importantly, this will potentially eliminate the challenge of rare earth resources. Furthermore, a single chip is used for excitation instead of a multichip, which can greatly reduce the cost of the devices.