New Deep-Blue-Emitting Ce-Doped A4–mBnC19+2mX29+m (A = Sr, La; B = Li; C = Si, Al; X = O, N; 0 ≤ m ≤ 1; 0 ≤ n ≤ 1) Phosphors for High-Color-Rendering Warm White Light-Emitting Diodes
datasetposted on 30.07.2019, 19:14 by Chun-Yun Wang, Takashi Takeda, Otmar Melvin ten Kate, Shiro Funahashi, Rong-Jun Xie, Kohsei Takahashi, Naoto Hirosaki
A new sialon Eu3.60LiSi13.78Al6.03O6.82N22.59 has been discovered via the single-particle diagnosis approach. Its crystal structure (space group P3m1) was solved and refined from single-crystal X-ray diffraction data. It has the interesting feature of two types of disorder at the Eu2 site: positional disorder (Eu2a/Eu2b) and substitutional disorder with (Si/Al)2(O/N). The structure is generalized to the formula A4–mBnC19+2mX29+m (A = Sr, La, Eu, Ce; B = Li; C = Si, Al; X = O, N; 0 ≤ m ≤ 1; 0 ≤ n ≤ 1), of which Sr3.61LiSi14.27Al5.61O6.19N23.25 (Sr–sialon, m = 0.41, n = 1) and La2.85Sr0.76LiSi14.86Al4.93O2.89N26.51 (LaSr-sialon, m = 0.40, n = 1) are two examples that have been obtained as a single-phase powder. Sr-sialon:Eu and LaSr-sialon:Eu both show blue to yellow emission, depending on the Eu concentration, whereas Sr-sialon:1% Ce shows a deep-blue emission band centered at 422 nm with a full width at half-maximum of 80 nm and an internal quantum efficiency of 80% (λex = 355 nm). The latter phosphor has very good thermal stability of both emission intensity and color. A white light-emitting diode (LED) containing the newly discovered Sr-sialon:5% Ce as the blue phosphor component shows excellent color-rendering indices (Ra = 96 and R12 = 97) with a correlated color temperature of 4255 K. This indicates that Sr-sialon:Ce is a highly promising deep-blue phosphor for illumination grade white LEDs.
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phosphor componentcolor-rendering indicesLa 2.85 Sr 0.76 LiSi 14.86 Al 4.93 O 2.89 N 26.51Eu 2adeep-blue emission bandlight-emitting diode80 nmlatter phosphorEu 2 sitesubstitutional disorderNew Deep-Blue-Emitting Ce-Doped4255 KR 12quantum efficiency355 nmEu concentration422 nmsialon Eu 3.60 LiSi 13.78 Al 6.03 O 6.82 N 22.59emission intensitysingle-particle diagnosis approachSr 3.61 LiSi 14.27 Al 5.61 O 6.19 N 23.25LEDcolor temperatureLaSr-sialoncrystal structureSr-sialonillumination gradedeep-blue phosphorWhite Light-Emitting Diodessingle-crystal X-ray diffraction datasingle-phase powder