Tunable luminescent spectra via energy transfers between different lattice sites in Ce3+, Mn2+ codoped Ba9Lu2Si6O24 phosphors for NUV-based warm white LED applications

Tunable luminescent spectra via energy transfers between different lattice sites in Ce3+, Mn2+... A series of Ce3+–Mn2+ codoped Ba9Lu2Si6O24 (BLS) were synthesized by high-temperature solid-state reactions. The 380–410 nm excitation band of Ce3+ at the Lu sites (Ce(1)) matches well with the emission light of commercial near-ultraviolet (NUV) light-emitting diode (LED) chips. Under the Ce(1) excitation, BLS:Ce3+, Mn2+ exhibited a tunable emission from blue–green to yellow–orange via energy transfers (ETs) from Ce(1) to Mn2+. The ET was demonstrated to be of the resonant type via a dipole–quadrupole mechanism. At room temperature (RT), the optimal internal and external quantum efficiencies (QEs) of BLS:Ce3+, Mn2+ were determined as 79 and 42%. At 150 °C, 85% of the RT QE still can be remained, showing a high thermal stability. A warm white LED (WLED) with a color rendering index of 84 and a correlated color temperature of 3660 K was obtained by combining a 395 nm NUV chip with the phosphor and CaAlSiN3:Eu2+. The efficiency reaches 17 lm W−1 at 20 mA, which is better than the value of most NUV-based WLEDs. These results indicate the promising application of the phosphor as an attractive candidate for WLEDs. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Materials Science: Materials in Electronics Springer Journals

Tunable luminescent spectra via energy transfers between different lattice sites in Ce3+, Mn2+ codoped Ba9Lu2Si6O24 phosphors for NUV-based warm white LED applications

Tunable luminescent spectra via energy transfers between different lattice sites in Ce3+, Mn2+ codoped Ba9Lu2Si6O24 phosphors for NUV-based warm white LED applications

3+ 2+ A series of Ce –Mn codoped Ba Lu Si O (BLS) were synthesized by high-temperature solid-state reactions. The 380– 9 2 6 24 3+ 410 nm excitation band of Ce at the Lu sites (Ce(1)) matches well with the emission light of commercial near-ultraviolet 3+ 2+ (NUV) light-emitting diode (LED) chips. Under the Ce(1) excitation, BLS:Ce, Mn exhibited a tunable emission from 2+ blue–green to yellow–orange via energy transfers (ETs) from Ce(1) to Mn . The ET was demonstrated to be of the resonant type via a dipole–quadrupole mechanism. At room temperature (RT), the optimal internal and external quantum efficiencies 3+ 2+ (QEs) of BLS:Ce, Mn were determined as 79 and 42%. At 150 °C, 85% of the RT QE still can be remained, showing a high thermal stability. A warm white LED (WLED) with a color rendering index of 84 and a correlated color temperature 2+ of 3660 K was obtained by combining a 395 nm NUV chip with the phosphor and CaAlSiN :Eu . The efficiency reaches −1 17 lm W at 20 mA, which is better than the value of most NUV-based WLEDs. These results indicate the promising application of the phosphor as an attractive candidate for WLEDs. 1 Introduction working current, leading to an unstable color hue. These 3+ drawbacks indicate YAG:Ce fails to meet the indoor illu- White light-emitting diodes (WLEDs) have drew much mination that prefers to warm white light with a low CCT attention in general illumination owing to their advantages (< 4000 K) and a high CRI (> 80). As an alternative routine, of high efficiency, energy savings, environmental friend- a LED composed by a near-ultraviolet (NUV) LED chip and liness, long service lifetime, etc. [1−7]. The commercial three-primary color (red, green, and blue) phosphors is able WLED commonly consists of a yellow-emitting phosphor to emit an ideal white light with a high CRI and a tunable 3+ 3+ Y A O :Ce (YAG:Ce ) and a blue-emitting...
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Publisher
Springer US
Copyright
Copyright © 2017 by Springer Science+Business Media, LLC, part of Springer Nature
Subject
Materials Science; Optical and Electronic Materials; Characterization and Evaluation of Materials
ISSN
0957-4522
eISSN
1573-482X
D.O.I.
10.1007/s10854-017-8404-2
Publisher site
See Article on Publisher Site

Abstract

A series of Ce3+–Mn2+ codoped Ba9Lu2Si6O24 (BLS) were synthesized by high-temperature solid-state reactions. The 380–410 nm excitation band of Ce3+ at the Lu sites (Ce(1)) matches well with the emission light of commercial near-ultraviolet (NUV) light-emitting diode (LED) chips. Under the Ce(1) excitation, BLS:Ce3+, Mn2+ exhibited a tunable emission from blue–green to yellow–orange via energy transfers (ETs) from Ce(1) to Mn2+. The ET was demonstrated to be of the resonant type via a dipole–quadrupole mechanism. At room temperature (RT), the optimal internal and external quantum efficiencies (QEs) of BLS:Ce3+, Mn2+ were determined as 79 and 42%. At 150 °C, 85% of the RT QE still can be remained, showing a high thermal stability. A warm white LED (WLED) with a color rendering index of 84 and a correlated color temperature of 3660 K was obtained by combining a 395 nm NUV chip with the phosphor and CaAlSiN3:Eu2+. The efficiency reaches 17 lm W−1 at 20 mA, which is better than the value of most NUV-based WLEDs. These results indicate the promising application of the phosphor as an attractive candidate for WLEDs.

Journal

Journal of Materials Science: Materials in ElectronicsSpringer Journals

Published: Dec 14, 2017

References

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