A comparison research on replacements of Ba2+ by Lu3+ and Ba2+-Si4+ by Lu3+-Al3+ in BaSi2O2N2:Eu phosphors

As a cyan-emitting oxonitridosilicate phosphor, BaSi2O2N2:Eu2+ can be used as competent cyan compensator to improve the color rendering index of white light-emitting diodes (WLEDs). However, low luminescence efficiency and poor thermal stability this type phosphor seriously suppress its actual application in full-spectrum lighting. The replacements Ba2+ by Lu3+ Ba2+-Si4+ Lu3+-Al3+ greatly increase intensity at same time. With doping, internal quantum ηIQE Ba0.925Si2O2N2:0.03Eu2+,0.045Lu3+ is 24.08% higher than that Ba0.97Si2O2N2:0.03Eu2+. After Al3+ co-doping, further increased 10.31% compared Ba0.925Si2O2N2:0.03Eu2+,0.045Lu3+. When temperature rises 473 K, maintains 62.32% room temperature, which increases 17.35% relative Ba0.97Si2O2N2:0.03Eu2+, while Ba0.925Si1.97O2N2:0.03Eu2+,0.045Lu3+,0.03Al3+ keeps 73.87% initial value, 18.52% mechanisms for improvement are proposed. Y3Al5O12:Ce3+ yellow CaAlSiN3:Eu2+ red mixed thoroughly coated on blue LED (450 nm) assemble WLED. WLED demonstrates (Ra) 97.1 150 mA, R1–R15 values all above 90. results indicate an effective WLED, BaSi2O2N2:Eu2+,Lu3+,Al3+ has great prospect field