Single-composition Al<sup>3+</sup>-singly doped ZnO phosphors for UV-pumped warm white light-emitting diode applications
Đỗ Quang Trung, Nguyễn Văn Quảng, Manh Trung Tran, Nguyen Van Du, Nguyen Tu, Nguyễn Duy Hùng, Dao Xuan Viet, D.D. Anh, Phạm Thành Huy
Abstract
The development of full-visible-spectrum phosphors is essential for next-generation light-emitting devices with better light quality. Herein, we report on a novel broad-band-emitting phosphor based on single-composition Al-doped ZnO phosphors. Under the UV excitation of 325 nm, the ZnO : Al phosphor exhibits a full spectrum emission in the visible wavelength range from 400 to 800 nm with a CIE chromaticity coordinate of (0.42, 0.48), a quantum efficiency of 43%, a color rendering index (CRI) of 74, a correlated color temperature (CCT) value of 3873 K and an activation energy of 0.22 eV. A prototype of a UV-pumped warm WLED with a high CRI of 87 and a CCT of 4067 K has been achieved by using only this broad-band-emitting Al3+-doped ZnO phosphor. The obtained results indicate that the single-composition Al3+-singly doped warm white emitting phosphor is a promising candidate for UV-pump warm white light-emitting diodes.