Structure evolution and photoluminescence of Lu3(Al, Mg)2(Al, Si)3O12:Ce3+ phosphors: new yellow-color converters for blue LED-driven solid state lighting. Issue 28 (4th July 2016)

• Record Type: Journal Article
• Authors: Ji, Haipeng; Wang, Le; Molokeev, Maxim S.; Hirosaki, Naoto; Xie, Rongjun; Huang, Zhaohui; Xia, Zhiguo; ten Kate, Otmar M.; Liu, Lihong; Atuchin, Victor V.
• Is Part Of: Journal of materials chemistry. Volume 4:Issue 28(2016)
• Page Start: 6855
• Page End: 6863
• Publication Date: 2016-07-04
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c6tc00966b
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : This paper reports the development of new phosphors using the chemical unit cosubstituting solid solution design strategy. Abstract : This paper reports the development of new phosphors using the chemical unit cosubstituting solid solution design strategy. Starting from Lu3 Al5 O12, the Al 3+ –Al 3+ couple in respective octahedral and tetrahedral coordination was simultaneously substituted by a Mg 2+ –Si 4+ pair forming the Lu3 (Al2− x Mg x )(Al3− x Si x )O12 :Ce 3+ ( x = 0.5–2.0) series; as a result, the CeO8 polyhedrons were compressed and the emission got red-shifted from green to yellow together with the broadening. The evolution of, the unit cell, the local structural geometry as well as the optical properties of Ce 3+ in these garnet creations, in response to the gradual Mg–Si substitution for Al–Al, were studied by combined techniques of structural refinement and luminescence measurements. The new composition Lu2.97 Ce0.03 Mg0.5 Al4 Si0.5 O12 was comprehensively evaluated regarding its potential application in blue LED-driven solid state white lighting: the maximum emission is at 550 nm under λ ex = 450 nm; the internal and external quantum efficiencies can reach 85% and 49%, respectively; a 1-phosphor-converted wLED lamp fabricated using the as-prepared phosphor exhibits the luminous efficacy of 105 lm W −1, the correlated color temperature of 6164 K and the color rendering index ( R a ) of 75.6. The new solid solution composition series is open for further optimization to enhance the competence for commercial consideration.