CAJ | 학술논문

新型单一基质型白色荧光粉是当前白光LED荧光粉研究的热点。宽带隙半导体BiOCl物化性质稳定，声子能量低，晶体结构对称性低、极化性强，具有作为稀土掺杂荧光粉基质材料的潜质。采用固相法制备了BiOCl∶Dy3＋及BiOCl∶Li＋，Dy3＋荧光粉，并采用XRD、激发和发射光谱研究了其结构和发光特性。XRD结果显示在500℃低温下即可成功合成出纯四方相的稀土掺杂BiOCl晶体，而Li＋掺入可进一步提高样品结晶度。在389 nm近紫外光激发下，荧光粉具有位于478 nm （蓝）和574 nm （黄）波段的Dy3＋特征发射峰，并呈现较低的蓝黄光发射比例和优异的白光发射特性。相比单掺体系，L i＋掺杂不仅使荧光粉发射增强，还实现了发光颜色的调节。研究结果表明，BiOCl∶Dy3＋荧光粉制备温度低，具有良好的近紫外光激发和白光发射特性，其较低黄蓝光发射比例性质可能与BiOCl独特的晶体结构有关；上述特性使其可能成为一种新型的潜在近紫外激发白光L ED荧光粉。
신형단일기질형백색형광분시당전백광LED형광분연구적열점。관대극반도체BiOCl물화성질은정，성자능량저，정체결구대칭성저、겁화성강，구유작위희토참잡형광분기질재료적잠질。채용고상법제비료BiOCl∶Dy3＋급BiOCl∶Li＋，Dy3＋형광분，병채용XRD、격발화발사광보연구료기결구화발광특성。XRD결과현시재500℃저온하즉가성공합성출순사방상적희토참잡BiOCl정체，이Li＋참입가진일보제고양품결정도。재389 nm근자외광격발하，형광분구유위우478 nm （람）화574 nm （황）파단적Dy3＋특정발사봉，병정현교저적람황광발사비례화우이적백광발사특성。상비단참체계，L i＋참잡불부사형광분발사증강，환실현료발광안색적조절。연구결과표명，BiOCl∶Dy3＋형광분제비온도저，구유량호적근자외광격발화백광발사특성，기교저황람광발사비례성질가능여BiOCl독특적정체결구유관；상술특성사기가능성위일충신형적잠재근자외격발백광L ED형광분。
In the present paper ,we reported the luminescence properties of BiOCl∶Dy3+ and BiOCl∶Dy3+ ,Li+ phosphor syn‐thesized by conventional solid state method .X‐ray diffraction (XRD) and excitation and emission spectroscopy were used to characterize the samples .Results show that pure tetragonal BiOCl∶Dy3+ crystals can be synthesized successfully at 500 ℃ ,and Li+ ion dopant improves the crystallinity of samples furtherly .Under near UV light excitation ,the samples give the characteris‐tic luminescence of Dy3+ ions located at 478 (blue) and 574 nm (yellow) ,which show a low yellow‐to‐blue intensity ratio (Y/B) of Dy3+ emission and white light emission .Moreover ,codoping of Li+ ion can realize the enhancement of emission intensity and the adjustment of emission color .The characteristics of BiOCl∶Dy3+ phosphor ,low temperature preparation ,good near ultravi‐olet excitation and white light emission make it to a promising near‐ultraviolet WLED phosphor .