Journal
DALTON TRANSACTIONS
Volume 45, Issue 11, Pages 4762-4770Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5dt04909a
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Funding
- Natural Science Foundation of Zhejiang Province [LR15E020001, LQ14E020006, LQ15E020004]
- National Natural Science Foundation of China [21271170, 51502066, 61372025, 51572065]
- 151 talent's projects in the second level of Zhejiang Province
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With an increasing demand for high-power warm white light emitting diodes (w-LEDs), the discovery of efficient red-emitting inorganic color converters is in great demand. Herein, a novel perovskite La0.5Na0.5TiO3:Eu3+ red-emitting phosphor with excellent thermal stability and high quantum efficiency has been successfully synthesized by a traditional solid-state reaction. Then, the developed La0.5Na0.5TiO3:Eu3+ red phosphor and commercial YAG:Ce3+ yellow phosphor were incorporated into an innovatively designed low-melting glass. Impressively, the destruction of La0.5Na0.5TiO3:Eu3+ and YAG:Ce3+ phosphor particles during glass melting was quite low. Remarkably, the fabricated w-LEDs using an InGaN-based blue chip combined with Phosphor in Glass (PiG) plates exhibited an improved chromaticity feature and superior optical performance. Through simply adjusting the content of red phosphors in the PiG, the correlated color temperature of the PiG-based w-LEDs evolved from cool white (6771 K) to warm white (4417 K) and the color rendering index increased from 73.4 to 86.4. Moreover, the PiG-based warm w-LEDs presented superior thermal stability.
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