A novel green‐emitting SrLaAlO4:Er3+ phosphor synthesized by co‐precipitation method for w-LEDs and optical thermometry

Abstract

A novel green-emitting Er3+ doped SrLaAlO4 phosphor has been synthesized successfully through one-step calcination of the precursor prepared by co-precipitation method. Meanwhile, the electronic structure and photoluminescence (PL) properties of the samples are investigated in detail. It is found that the strongest excitation peak among the several narrow excitation bands from 250 nm to 500 nm locates in near-UV region, indicating that the phosphor can match well with not only blue LED chips but also near-UV LED chips. Under the excitation of 377 nm light, the SrLaAlO4 phosphor can emit bright green light peaking at 527 nm and 548 nm simultaneously. In addition, the different responses of the two emission positions to temperature variation of SrLaAlO4:Er3+ phosphor have been verified and expounded. The temperature sensing properties of SrLaAlO4:Er3+ in a wide range of 298–573 K show a good exponential function relationship between ratiometric intensity and temperature (R2 > 0.999) as well as a high sensitivity (1.42% K− 1). Besides, the CIE coordinates diagram shows that this phosphor has an outstanding color stability. In view of the outstanding performance in the PL, thermal stability and sensitivity, SrLaAlO4:Er3+ phosphor can be promisingly applied in near ultraviolet converted white light LED devices (wLEDs) and optical thermometry.