A novel Eu activated CaZnTeO tellurate red phosphor for white LEDs with high color stability and color purity
Research into red phosphors with a high color rendering index is particularly compelling, given the absence of a red component in the spectrum of commercial pc-WLEDs, which combine blue LED chips with yellow-emitting YAG:Ce 3+ phosphors. Herein, we reported a novel Eu 3+ activated Ca 3 Zn 3 Te 2 O 1...
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| Published in | New journal of chemistry Vol. 48; no. 2; pp. 9314 - 9321 |
|---|---|
| Main Authors | , , , , , , |
| Format | Journal Article |
| Published |
20.05.2024
|
| Online Access | Get full text |
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| Summary: | Research into red phosphors with a high color rendering index is particularly compelling, given the absence of a red component in the spectrum of commercial pc-WLEDs, which combine blue LED chips with yellow-emitting YAG:Ce
3+
phosphors. Herein, we reported a novel Eu
3+
activated Ca
3
Zn
3
Te
2
O
12
red-emitting phosphor, synthesized using a conventional high-temperature solid-phase method. The phase and crystal structures were analyzed by powder X-ray diffraction and Rietveld refinement. The optimal excitation peak of the Ca
3
Zn
3
Te
2
O
12
:Eu
3+
phosphor was located at 395 nm, matching those of conventional commercial near-ultraviolet chips. In addition, the Ca
3
Zn
3
Te
2
O
12
:9%Eu
3+
phosphor exhibited good thermal stability, with an activation energy of 0.267 eV, and the CIE color coordinates hardly changed with temperature. Ultimatel, a high-quality white LED device was fabricated by combining Ca
3
Zn
3
Te
2
O
12
:9%Eu
3+
red phosphor, a commercial BaMgAl
10
O
17
:Eu
2+
blue phosphor, and(Ba,Sr)
2
SiO
4
:Eu
2+
green phosphor with a 395 nm near-UV chip. Despite a substantial increase in the input current from 20 to 320 mA, the white-LED maintained a stable color rendering index of around 80, highlighting its consistent performance. These results indicated that Eu
3+
activated Ca
3
Zn
3
Te
2
O
12
phosphors are promising red emission candidates for white LEDs pumped by near ultraviolet chips.
Research into red phosphors with a high color rendering index is particularly compelling, given the absence of a red component in the spectrum of commercial pc-WLEDs, which combine blue LED chips with yellow-emitting YAG:Ce
3+
phosphors. |
|---|---|
| Bibliography: | https://doi.org/10.1039/d4nj01281j Electronic supplementary information (ESI) available. See DOI |
| ISSN: | 1144-0546 1369-9261 |
| DOI: | 10.1039/d4nj01281j |