Learning from a Mineral Structure toward an Ultra-Narrow-Band Blue-Emitting Silicate Phosphor RbNa3 (Li3 SiO4 )4 :Eu2

Hongxu Liao; Ming Zhao; Maxim S Molokeev; Quanlin Liu; Zhiguo Xia

doi:10.1002/anie.201807087

Learning from a Mineral Structure toward an Ultra-Narrow-Band Blue-Emitting Silicate Phosphor RbNa₃ (Li₃ SiO₄ )₄ :Eu²

Angew Chem Int Ed Engl. 2018 Sep 3;57(36):11728-11731. doi: 10.1002/anie.201807087. Epub 2018 Aug 3.

Authors

Hongxu Liao¹, Ming Zhao¹, Maxim S Molokeev^{2

3

4}, Quanlin Liu¹, Zhiguo Xia¹

Affiliations

¹ The Beijing Municipal Key Laboratory of New Energy Materials and Technologies, School of Materials Sciences and Engineering, University of Science and Technology Beijing, Beijing, 100083, P. R. China.
² Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russia.
³ Siberian Federal University, Krasnoyarsk, 660041, Russia.
⁴ Department of Physics, Far Eastern State Transport University, Khabarovsk, 680021, Russia.

PMID: 30073730
DOI: 10.1002/anie.201807087

Abstract

Learning from natural mineral structures is an efficient way to develop potential host lattices for applications in phosphor converted (pc)LEDs. A narrow-band blue-emitting silicate phosphor, RbNa₃ (Li₃ SiO₄ )₄ :Eu²⁺ (RNLSO:Eu²⁺ ), was derived from the UCr₄ C₄ -type mineral model. The broad excitation spectrum (320-440 nm) indicates this phosphor can be well matched with the near ultraviolet (n-UV) LED chip. Owing to the UCr₄ C₄ -type highly condensed and rigid framework, RNLSO:Eu²⁺ exhibits an extremely small Stokes shift and an unprecedented ultra-narrow (full-width at half-maximum, FWHM=22.4 nm) blue emission band (λ_em =471 nm) as well as excellent thermal stability (96 %@150 °C of the initial integrated intensity at 25 °C). The color gamut of the as-fabricated (pc)LEDs is 75 % NTSC for the application in liquid crystal displays from the prototype design of an n-UV LED chip and the narrow-band RNLSO:Eu²⁺ (blue), β-SiAlON:Eu²⁺ (green), and K₂ SiF₆ :Mn⁴⁺ (red) components as RGB emitters.

Keywords: luminescence; minerals; phosphors; rigid structure; silicates.