In:
Journal of the American Ceramic Society, Wiley, Vol. 103, No. 11 ( 2020-11), p. 6075-6080
Abstract:
It has been an urgent need for developing a new bright long‐wave emitting phosphor to improve the color rendering index (CRI) of white light‐emitting diodes (WLEDs). Here, based on the concept of oxygen vacancy‐induced long‐wave emission by Bi 3+ doping, we selected BaSrGa 4 O 8 as the matrix, which has a low‐dimensional chain structure that can produce enough oxygen vacancies. After the introduction of Bi 3+ , orange emission was successfully achieved. To further improve the luminescence efficiency, the system of BaSrGa 4 O 8 :Bi 3+ ,K + was designed. Interestingly, although significant emission enhancement was obtained, the material showed reduced absorption with increased oxygen vacancies. More detailed experimental evidences confirm that oxygen vacancies can activate Bi 3+ to achieve long‐wave emission. Our results provide a new way to design Bi 3+ ‐based long‐wave emitting phosphors with low‐dimensional crystal structure. Finally, a WLED device containing BaSrGa 4 O 8 :Bi 3+ ,K + was fabricated and exhibited an enhanced CRI, which shows a promising application in WLEDs.
Type of Medium:
Online Resource
ISSN:
0002-7820
,
1551-2916
DOI:
10.1111/jace.v103.11
Language:
English
Publisher:
Wiley
Publication Date:
2020
detail.hit.zdb_id:
2008170-4
detail.hit.zdb_id:
219232-9
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