| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1647025 | Materials Letters | 2012 | 4 Pages |
Zn2 +-codoped alikali earth sulfide, (Sr, Ca, Zn)S:Eu2 +, was synthesized by a solid-state reaction. The synthesized phosphor was efficiently excited in a broad spectral range from 400 to 500 nm, and exhibits a strong and broad-band red emission. Zn2 +-codoping greatly enhanced the emission of this sulfide phosphor. By adjusting the ratio of Sr2 + to Ca2 + in the host, the emission wavelength could be tuned in a range of 606–645 nm. Red and white LEDs were fabricated with this phosphor and blue chips. The red LED shows a high color purity of 92%, while the white LED has CIE coordinates, Tc and Ra of (0.4051, 0.3841), 3450 K, and 80, respectively.
► Excitation of (Sr, Ca, Zn)S: Eu2 + was suitable for blue LED. ► Zn2 +-codoping greatly enhanced the emission of this sulfide phosphor. ► The emission wavelength can be tuned in range of 606–645 nm with different Ca2 + content. ► The prototype red LED has a high color purity of 92%. ► The white LED has a CIE coordinate, Tc and Ra of (0.4051, 0.3841), 3450 K, and 80.
