Red-Emitting LiLa[sub 2]O[sub 2]BO[sub 3]:Sm[sup 3+],Eu[sup 3+] Phosphor for Near-Ultraviolet Light-Emitting Diodes-Based Solid-State Lighting

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Abstract
A red-emitting LiLa2O2BO3:Sm3+,Eu3+LiLa2O2BO3:Sm3+,Eu3+ phosphor has been synthesized and characterized optically for white light-emitting diodes (LEDs). Because the oxyborate group (O2BO3−7)(O2BO3−7) can contain high Eu3+Eu3+ concentration without concentration quenching, LiLa2O2BO3LiLa2O2BO3 is a suitable host material for red-emitting phosphor for near-ultraviolet (n-UV) LEDs. When LiLa2O2BO3:Eu3+LiLa2O2BO3:Eu3+ was co-doped with Sm3+Sm3+ , emission intensity of Eu3+Eu3+ was enhanced by ∼30%∼30% than that of the sample without Sm3+Sm3+ owing to the energy transfer from Sm3+Sm3+ to Eu3+Eu3+ . This energy transfer was confirmed by faster decay times of Sm3+Sm3+ as energy donors. LiLa2O2BO3:Sm3+,Eu3+LiLa2O2BO3:Sm3+,Eu3+ showed a relative brightness of 334.7% of that of Y2O2S:Eu3+Y2O2S:Eu3+ , commercial red-emitting phosphor for n-UV LEDs.

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