A high quantum yield red phosphor NaGdSiO4: Eu3+ with intense emissions from the 5D0????????7F1,2 transition

Red phosphors with a high quantum yield and a lower thermal quenching are needed to improve the luminescence efficiency and the stability of phosphor-converted white light-emitting diodes (pc-WLEDs). We have designed a high quantum yield NaGdSiO4 (NGSO) based phosphor with enhanced Eu3+ emissions of the D-5(0)-> F-7(1) and D-5(0)->???????F-7(2) transitions. This design is based on the Eu3+ at both the inversion and non-inversion symmetry sites. In detail, we have studied the structure, morphology, and luminescence properties of NGSO: Eu3+ phosphors. Using a 394 nm UV excitation, a series of Eu3+ emissions of D-5(0)->???????F-7(J) (0-4) transitions has been observed. The internal quantum efficiency (IQE) is 83.42% and the red color purity is 91.4%. These values are much higher than some reported results. The higher IQE and double intense D-5(0)->???????F-7(1) and D-5(0)->???????F-7(2) emissions might originate from an unusual structure disorder around Eu3+ ions in the NGSO lattice. The lifetime of the optimal phosphor NGSO: 0.5Eu(3+) is about 2 ms, suitable for solid-state lighting. The intensities of the strong emissions at 595 and 624 nm of NGSO: 0.5Eu(3+) at 150 ? is about 85% of that at 30 ?, demonstrating its excellent thermal stability. Furthermore, this red NGSO: 0.5Eu(3+) phosphor was packaged into a warm pc-WLED, exhibiting a lower correlated color temperature (CCT) of 4222 K and a comparable color rendering index (CRI) of 86.7. These results show that this red phosphor could act as a red component of pc-WLEDs excited by the n-UV LED chip.

Automated summary

In this study, a high quantum yield NaGdSiO4-based red phosphor with enhanced Eu3+ emissions and good thermal stability was designed. The phosphor showed higher intensity and purity of Eu3+ emissions, possibly due to its unusual structure disorder. The red phosphor also exhibited good thermal stability at high temperature, making it suitable for solid-state lighting.