Details

Autor(en) / Beteiligte

• Ming, Wenmei
• Shi, Hongliang
• Du, Mao-Hua

Titel

Doping Y2O3 with Mn4+ for energy-efficient lighting

Ist Teil von

• Journal of materials chemistry. C, Materials for optical and electronic devices, 2018-01, Vol.6 (15), p.4171-4176

Ort / Verlag

Cambridge: Royal Society of Chemistry

Erscheinungsjahr

2018

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Developing energy-efficient LEDs that emit warm white light requires new red phosphors with appropriate emission wavelengths and band widths. Mn 4+ -activated Y 2 O 3 is a potential red LED phosphor with narrow emission and improved emission wavelength compared to previously known Mn 4+ -activated oxide phosphors. In this work, the dopability and the oxidation state of Mn in Y 2 O 3 are investigated based on the formation energies of native defects, Mn dopants, and divalent co-dopants ( i.e. , Ca, Sr, Cd, and Zn) calculated using hybrid density functional theory. We found that Mn 4+ is difficult to form in Y 2 O 3 without co-doping. Stabilizing Mn 4+ on Y 3+ sites (forming Mn + Y donors) requires the co-doping of compensating acceptors (Ca or Sr) in oxygen-rich growth environments. Develop Y 2 O 3 :Mn 4+ red phosphors for energy-efficient warm white LED lighting.