Structure and Photoluminescence of A Blue‐Green‐Emitting Phosphor for Near‐UV White LEDs |
| |
Authors: | Hongya Ling Jinping Huang Binghu Hou Jie Liu Xibin Yu |
| |
Affiliation: | Department of Chemistry, Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, , Shanghai, 200234 China |
| |
Abstract: | A series of phosphors Ca12(0.97?x)Al14O32F2: 0.03Ce3+, xTb3+ have been prepared by a hightemperature solid‐state reaction using boric acid as flux. These oxyfluorides crystallize in cubic structure, space group. Under the near ultraviolet excitation within wavelength range 310–390 nm, Ca12(0.97?x)Al14O32F2: 0.03Ce3+, xTb3+ phosphors exhibit an intense emission covering a broad band of 370–500 nm derived from the 5d→4f transitions of Ce3+ and a characteristic emission at 544 nm of Tb3+. The emission can be tuned from blue to green by altering the relative ratio of Ce3+ to Tb3+ in the composition. The energy‐transfer mechanism from Ce3+ to Tb3+ is investigated based on the site occupancy of the luminescence center in the crystal structure of the Ca12Al14O32F2 host. More importantly, when a certain amount of boric acid is added as flux in the synthesis, the fluorescence intensity of the phosphors increases about 65%. Because of its broad excitation and efficiently tunable blue to green luminescence, the Ca12(0.97?x)Al14O32F2: 0.03Ce3+, xTb3+ phosphors may find promising application as a near UV‐convertible phosphor for white‐light‐emitting diodes. |
| |
Keywords: | |
|
|