Enhancement of Emission and Negative Thermal Quenching Effect of Na₂TiF₆:Mn⁴⁺,TEAH⁺ by Antenna Effect of TEAH⁺

Abstract

In order to develop new red-emitting phosphors, in this work, a series of organic-inorganic hybrid Na 2 TiF 6 : Mn 4 + , (CH 3 CH 2 ) 3 NH + (NTF : Mn 4 + , TEAH + ) red-emitting phosphors have been prepared. Due to the antenna effect of TEAH + , double improvement in emission intensity and luminous thermal stability of the optimal sample are obtained: (a) The integrated emission intensity of the hybrid NTF : Mn 4 + ,TEAH + sample is 150 % of the un-doping one (NTF : Mn 4 + ), (b) The luminescent thermal stability of the hybrid NTF : Mn 4 + ,TEAH + sample is obviously increased because of strong negative thermal quenching (NTQ) effect. The integrated emission intensity at 150 °C is 176.2 % of the initial value at 30 °C, and the intensity at 178 °C is still 100 % of the initial one. The strong NTQ effect is attributed to the driving of the antenna effect of TEAH + . The above double improvements make the optimal sample has extensive application prospects for daily lighting white light-emitting diodes (WLEDs).