Journal
ADVANCED PHOTONICS RESEARCH
Volume 2, Issue 3, Pages -Publisher
WILEY
DOI: 10.1002/adpr.202000089
Keywords
energy transfers; host sensitizations; lanthanide; light-emitting diodes; photoluminescence
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Funding
- National Natural Science Foundation of China [21773200]
- Research Grants Council of Hong Kong [CityU 11204717]
- Centre for Functional Photonics (CFP) of City University of Hong Kong
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This study presents a general method to enhance lanthanide luminescence within a semiconductor host, demonstrating efficient energy transfer with the assistance of codopants, and successfully constructing a phosphor-converted LED.
Lanthanide ions are appealing for luminescence applications due to their sharp and tunable emission lines spanning the whole spectral range. However, the parity-forbidden nature of the electronic transition in lanthanide ions typically results in ineffective excitation processes, which is a major obstacle to practical applications of lanthanide-based luminescent materials. Herein, a general method to sensitize lanthanide luminescence within a semiconductor host of CaZnOS is developed. Efficient energy transfer from the host to a series of lanthanide ions with the assistance of Cu+ or Mn2+ codopants is demonstrated, which introduces intermediate energy states to mediate the energy transfer processes. Accordingly, a wide spectrum of emission is achieved by a single band excitation in the near-ultraviolet region. Due to the efficient host sensitization, a phosphor-converted light-emitting diode (LED) is constructed by integrating the lanthanide-doped CaZnOS with an ultraviolet LED chip, which is used for near-infrared studies of biological tissues.
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